这个世界本就不公平

这个世界，本来就不公平。

唐伯虎十六岁就考上了秀才，曾国藩考了七次才考上秀才。

左宗棠二十岁就考中了举人，蒲松龄直到七十岁也没中举。

有的人，出名要趁早。

有的人，大器才晚成。

每个人都有每个人的路要走，不能一概而论。

人生不怕重头再来，只怕从未开始，再来一次，只不过是为了创造一个更好的机会。

毕竟，这个世界只以结果论英雄，只以价值论成败。

正如走路一样，有的人从未摔倒，就会了走路，有的人摔倒了无数次，才学会走路。

我们不能说，我一次就会了，而你走了这么多次，这不公平。

难道说，因为不公平，就让曾国藩一辈子翻不了身，就让蒲松龄一辈子松散了命运，就让总是跌倒的人一辈子不能走路，这就公平了吗？

所以说，公平都是由人创造出来的。

在这个看似不公平的世界中，我们依然可以奋斗出一个公平的人生。

不负此生，这就是所谓的最公平了。

再也不踩坑的Kubernetes实战指南

一、安装前必读

1、请不要使用带中文的操作系统服务器和虚拟机。

2、生产环境建议使用二进制安装方式。

3、文档中的IP地址请统一替换，不要一个一个替换！！！

4、如果是一个一个替换的，请不要找我排查故障！！！！！！！

二、kubeadm高可用安装k8s集群

1、基本环境安装

Kubeadm安装方式自1.14版本以后，安装方法几乎没有任何变化，此文档可以尝试安装最新的k8s集群，centos采用的是7.x版本。

PS:

K8S官网：https://kubernetes.io/docs/setup/

最新版高可用安装：https://kubernetes.io/docs/setup/production-environment/tools/kubeadm/high-availability/

主机名IP地址说明
k8s-master01 ~ 03192.168.0.107 ~ 203master节点 * 3
k8s-master-lb192.168.0.236keepalived虚拟IP
k8s-node01 ~ 02192.168.0.110 ~ 205worker节点 * 2
表1-1  高可用Kubernetes集群规划
配置信息备注
系统版本CentOS 7.9
Docker版本 19.03.x
Pod网段 172.168.0.0/12
Service网段10.96.0.0/12
表1-2安装环境信息

注意：VIP（虚拟IP）不要和内网IP重复，首先去ping一下，不通才可用。VIP需要和主机在同一个局域网内！公有云上搭建VIP是公有云的负载均衡的IP，比如阿里云的内网SLB的地址，腾讯云内网ELB的地址。

2、修改hosts

所有节点配置hosts，修改/etc/hosts如下：

[root@k8s-master01 ~]# cat /etc/hosts
192.168.0.107 k8s-master01
192.168.0.108 k8s-master02
192.168.0.109 k8s-master03
192.168.0.236 k8s-master-lb # 如果不是高可用集群，该IP为Master01的IP
192.168.0.110 k8s-node01
192.168.0.111 k8s-node02

3、CentOS7安装yum源如下：

curl -o /etc/yum.repos.d/CentOS-Base.repo https://mirrors.aliyun.com/repo/Centos-7.repo

yum install -y yum-utils device-mapper-persistent-data lvm2

yum-config-manager --add-repo https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo

cat <<EOF > /etc/yum.repos.d/kubernetes.repo
[kubernetes]
name=Kubernetes
baseurl=https://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64/
enabled=1
gpgcheck=1
repo_gpgcheck=1
gpgkey=https://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg https://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg
EOF
sed -i -e '/mirrors.cloud.aliyuncs.com/d' -e '/mirrors.aliyuncs.com/d' /etc/yum.repos.d/CentOS-Base.repo

4、必备工具安装

yum install wget jq psmisc vim net-tools telnet yum-utils device-mapper-persistent-data lvm2 git -y

5、所有节点关闭防火墙、selinux、dnsmasq、swap。服务器配置如下：

systemctl disable --now firewalld 
systemctl disable --now dnsmasq
systemctl disable --now NetworkManager

setenforce 0
sed -i 's#SELINUX=enforcing#SELINUX=disabled#g' /etc/sysconfig/selinux
sed -i 's#SELINUX=enforcing#SELINUX=disabled#g' /etc/selinux/config

6、关闭SWAP分区

swapoff -a && sysctl -w vm.swappiness=0
sed -ri '/^[^#]*swap/s@^@#@' /etc/fstab

7、安装ntpdate

rpm -ivh http://mirrors.wlnmp.com/centos/wlnmp-release-centos.noarch.rpm
yum install ntpdate -y

8、所有节点同步时间。时间同步配置如下：

ln -sf /usr/share/zoneinfo/Asia/Shanghai /etc/localtime
echo 'Asia/Shanghai' >/etc/timezone
ntpdate time2.aliyun.com
# 加入到crontab
*/5 * * * * /usr/sbin/ntpdate time2.aliyun.com

9、所有节点配置limit

ulimit -SHn 65535

vim /etc/security/limits.conf
# 末尾添加如下内容
* soft nofile 655360
* hard nofile 131072
* soft nproc 655350
* hard nproc 655350
* soft memlock unlimited
* hard memlock unlimited

10、Master01节点免密钥登录其他节点，安装过程中生成配置文件和证书均在Master01上操作，集群管理也在Master01上操作，阿里云或者AWS上需要单独一台kubectl服务器。密钥配置如下：

ssh-keygen -t rsa
for i in k8s-master01 k8s-master02 k8s-master03 k8s-node01 k8s-node02;do ssh-copy-id -i .ssh/id_rsa.pub $i;done

11、下载安装所有的源码文件：

cd /root/ ; git clone https://github.com/dotbalo/k8s-ha-install.git

12、所有节点升级系统并重启，此处升级没有升级内核，下节会单独升级内核：

yum update -y --exclude=kernel* && reboot #CentOS7需要升级，CentOS8可以按需升级系统

13、内核配置

CentOS7 需要升级内核至4.18+，本地升级的版本为4.19

13.1、在master01节点下载内核：

cd /root
wget http://193.49.22.109/elrepo/kernel/el7/x86_64/RPMS/kernel-ml-devel-4.19.12-1.el7.elrepo.x86_64.rpm
wget http://193.49.22.109/elrepo/kernel/el7/x86_64/RPMS/kernel-ml-4.19.12-1.el7.elrepo.x86_64.rpm

13.2、从master01节点传到其他节点：

for i in k8s-master02 k8s-master03 k8s-node01 k8s-node02;do scp kernel-ml-4.19.12-1.el7.elrepo.x86_64.rpm kernel-ml-devel-4.19.12-1.el7.elrepo.x86_64.rpm $i:/root/ ; done

13.3、所有节点安装内核：

cd /root && yum localinstall -y kernel-ml*

13.4、所有节点更改内核启动顺序：

grub2-set-default  0 && grub2-mkconfig -o /etc/grub2.cfg

grubby --args="user_namespace.enable=1" --update-kernel="$(grubby --default-kernel)"

13.5、检查默认内核是不是4.19

[root@k8s-master02 ~]# grubby --default-kernel
/boot/vmlinuz-4.19.12-1.el7.elrepo.x86_64

13.6、所有节点重启，然后检查内核是不是4.19

[root@k8s-master02 ~]# uname -a
Linux k8s-master02 4.19.12-1.el7.elrepo.x86_64 #1 SMP Fri Dec 21 11:06:36 EST 2018 x86_64 x86_64 x86_64 GNU/Linux

13.7、所有节点安装ipvsadm

yum install ipvsadm ipset sysstat conntrack libseccomp -y

13.8、所有节点配置ipvs模块，在内核4.19+版本nf_conntrack_ipv4已经改为nf_conntrack， 4.18以下使用nf_conntrack_ipv4即可：

modprobe -- ip_vs
modprobe -- ip_vs_rr
modprobe -- ip_vs_wrr
modprobe -- ip_vs_sh
modprobe -- nf_conntrack
vim /etc/modules-load.d/ipvs.conf 
	# 加入以下内容
ip_vs
ip_vs_lc
ip_vs_wlc
ip_vs_rr
ip_vs_wrr
ip_vs_lblc
ip_vs_lblcr
ip_vs_dh
ip_vs_sh
ip_vs_fo
ip_vs_nq
ip_vs_sed
ip_vs_ftp
ip_vs_sh
nf_conntrack
ip_tables
ip_set
xt_set
ipt_set
ipt_rpfilter
ipt_REJECT
ipip

13.9、然后执行即可：

systemctl enable --now systemd-modules-load.service

14、开启一些k8s集群中必须的内核参数，所有节点配置k8s内核：

cat <<EOF > /etc/sysctl.d/k8s.conf
net.ipv4.ip_forward = 1
net.bridge.bridge-nf-call-iptables = 1
net.bridge.bridge-nf-call-ip6tables = 1
fs.may_detach_mounts = 1
vm.overcommit_memory=1
vm.panic_on_oom=0
fs.inotify.max_user_watches=89100
fs.file-max=52706963
fs.nr_open=52706963
net.netfilter.nf_conntrack_max=2310720

net.ipv4.tcp_keepalive_time = 600
net.ipv4.tcp_keepalive_probes = 3
net.ipv4.tcp_keepalive_intvl =15
net.ipv4.tcp_max_tw_buckets = 36000
net.ipv4.tcp_tw_reuse = 1
net.ipv4.tcp_max_orphans = 327680
net.ipv4.tcp_orphan_retries = 3
net.ipv4.tcp_syncookies = 1
net.ipv4.tcp_max_syn_backlog = 16384
net.ipv4.ip_conntrack_max = 65536
net.ipv4.tcp_max_syn_backlog = 16384
net.ipv4.tcp_timestamps = 0
net.core.somaxconn = 16384
EOF
sysctl --system

15、所有节点配置完内核后，重启服务器，保证重启后内核依旧加载

reboot
lsmod | grep --color=auto -e ip_vs -e nf_conntrack

16、基本组件安装

本节主要安装的是集群中用到的各种组件，比如Docker-ce、Kubernetes各组件等。

16.1、所有节点安装Docker-ce 19.03

yum install docker-ce-19.03.* docker-cli-19.03.* -y

16.2、由于新版kubelet建议使用systemd，所以可以把docker的CgroupDriver改成systemd

mkdir /etc/docker
cat > /etc/docker/daemon.json <<EOF
{
  "exec-opts": ["native.cgroupdriver=systemd"]
}
EOF

16.3、所有节点设置开机自启动Docker：

systemctl daemon-reload && systemctl enable --now docker

16.4、安装k8s组件：

yum list kubeadm.x86_64 --showduplicates | sort -r

16.5、所有节点安装最新版本kubeadm：

yum install kubeadm-1.20* kubelet-1.20* kubectl-1.20* -y

16.6、默认配置的pause镜像使用gcr.io仓库，国内可能无法访问，所以这里配置
Kubelet使用阿里云的pause镜像：

cat >/etc/sysconfig/kubelet<<EOF
KUBELET_EXTRA_ARGS="--cgroup-driver=systemd --pod-infra-container-image=registry.cn-hangzhou.aliyuncs.com/google_containers/pause-amd64:3.2"
EOF

16.7、设置Kubelet开机自启动：

systemctl daemon-reload
systemctl enable --now kubelet

17、高可用组件安装

公有云要用公有云自带的负载均衡，比如阿里云的SLB，腾讯云的ELB，用来替代haproxy
和keepalived，因为公有云大部分都是不支持keepalived的，另外如果用阿里云的话，kubectl控制端不能放在master节点，推荐使用腾讯云，因为阿里云的slb有回环的问题，也就是slb代理的服务器不能反向访问SLB，但是腾讯云修复了这个问题。

注意：如果不是高可用集群，haproxy和keepalived无需安装。

17.1、所有Master节点通过yum安装HAProxy和KeepAlived：

yum install keepalived haproxy -y

17.2、所有Master节点配置HAProxy（详细配置参考HAProxy文档，所有Master节点的HAProxy配置相同）：

[root@k8s-master01 etc]# mkdir /etc/haproxy
[root@k8s-master01 etc]# vim /etc/haproxy/haproxy.cfg 
global
  maxconn  2000
  ulimit-n  16384
  log  127.0.0.1 local0 err
  stats timeout 30s

defaults
  log global
  mode  http
  option  httplog
  timeout connect 5000
  timeout client  50000
  timeout server  50000
  timeout http-request 15s
  timeout http-keep-alive 15s

frontend monitor-in
  bind *:33305
  mode http
  option httplog
  monitor-uri /monitor

frontend k8s-master
  bind 0.0.0.0:16443
  bind 127.0.0.1:16443
  mode tcp
  option tcplog
  tcp-request inspect-delay 5s
  default_backend k8s-master

backend k8s-master
  mode tcp
  option tcplog
  option tcp-check
  balance roundrobin
  default-server inter 10s downinter 5s rise 2 fall 2 slowstart 60s maxconn 250 maxqueue 256 weight 100
  server k8s-master01	192.168.0.107:6443  check
  server k8s-master02	192.168.0.108:6443  check
  server k8s-master03	192.168.0.109:6443  check

17.3、所有Master节点配置KeepAlived，配置不一样，注意区分 [root@k8s-master01 pki]# vim /etc/keepalived/keepalived.conf ，注意每个节点的IP和网卡（interface参数）

Master01节点的配置：

[root@k8s-master01 etc]# mkdir /etc/keepalived

[root@k8s-master01 ~]# vim /etc/keepalived/keepalived.conf 
! Configuration File for keepalived
global_defs {
    router_id LVS_DEVEL
script_user root
    enable_script_security
}
vrrp_script chk_apiserver {
    script "/etc/keepalived/check_apiserver.sh"
    interval 5
    weight -5
    fall 2  
rise 1
}
vrrp_instance VI_1 {
    state MASTER
    interface ens33
    mcast_src_ip 192.168.0.107
    virtual_router_id 51
    priority 101
    advert_int 2
    authentication {
        auth_type PASS
        auth_pass K8SHA_KA_AUTH
    }
    virtual_ipaddress {
        192.168.0.236
    }
    track_script {
       chk_apiserver
    }
}

Master02节点的配置：

! Configuration File for keepalived
global_defs {
    router_id LVS_DEVEL
script_user root
    enable_script_security
}
vrrp_script chk_apiserver {
    script "/etc/keepalived/check_apiserver.sh"
   interval 5
    weight -5
    fall 2  
rise 1
}
vrrp_instance VI_1 {
    state BACKUP
    interface ens33
    mcast_src_ip 192.168.0.108
    virtual_router_id 51
    priority 100
    advert_int 2
    authentication {
        auth_type PASS
        auth_pass K8SHA_KA_AUTH
    }
    virtual_ipaddress {
        192.168.0.236
    }
    track_script {
       chk_apiserver
    }
}

Master03节点的配置：

! Configuration File for keepalived
global_defs {
    router_id LVS_DEVEL
script_user root
    enable_script_security
}
vrrp_script chk_apiserver {
    script "/etc/keepalived/check_apiserver.sh"
 interval 5
    weight -5
    fall 2  
rise 1
}
vrrp_instance VI_1 {
    state BACKUP
    interface ens33
    mcast_src_ip 192.168.0.109
    virtual_router_id 51
    priority 100
    advert_int 2
    authentication {
        auth_type PASS
        auth_pass K8SHA_KA_AUTH
    }
    virtual_ipaddress {
        192.168.0.236
    }
    track_script {
       chk_apiserver
    }
}

所有master节点配置KeepAlived健康检查文件：

[root@k8s-master01 keepalived]# cat /etc/keepalived/check_apiserver.sh 
#!/bin/bash

err=0
for k in $(seq 1 3)
do
    check_code=$(pgrep haproxy)
    if [[ $check_code == "" ]]; then
        err=$(expr $err + 1)
        sleep 1
        continue
    else
        err=0
        break
    fi
done

if [[ $err != "0" ]]; then
    echo "systemctl stop keepalived"
    /usr/bin/systemctl stop keepalived
    exit 1
else
    exit 0
fi
chmod +x /etc/keepalived/check_apiserver.sh

启动haproxy和keepalived

[root@k8s-master01 keepalived]# systemctl daemon-reload
[root@k8s-master01 keepalived]# systemctl enable --now haproxy
[root@k8s-master01 keepalived]# systemctl enable --now keepalived

重要：如果安装了keepalived和haproxy，需要测试keepalived是否是正常的

测试VIP
[root@k8s-master01 ~]# ping 192.168.0.236 -c 4
PING 192.168.0.236 (192.168.0.236) 56(84) bytes of data.
64 bytes from 192.168.0.236: icmp_seq=1 ttl=64 time=0.464 ms
64 bytes from 192.168.0.236: icmp_seq=2 ttl=64 time=0.063 ms
64 bytes from 192.168.0.236: icmp_seq=3 ttl=64 time=0.062 ms
64 bytes from 192.168.0.236: icmp_seq=4 ttl=64 time=0.063 ms

--- 192.168.0.236 ping statistics ---
4 packets transmitted, 4 received, 0% packet loss, time 3106ms
rtt min/avg/max/mdev = 0.062/0.163/0.464/0.173 ms
[root@k8s-master01 ~]# telnet 192.168.0.236 16443
Trying 192.168.0.236...
Connected to 192.168.0.236.
Escape character is '^]'.
Connection closed by foreign host.

如果ping不通且telnet没有出现 ] ，则认为VIP不可以，不可在继续往下执行，需要排查keepalived的问题，比如防火墙和selinux，haproxy和keepalived的状态，监听端口等

所有节点查看防火墙状态必须为disable和inactive：systemctl status firewalld

所有节点查看selinux状态，必须为disable：getenforce

master节点查看haproxy和keepalived状态：systemctl status keepalived haproxy

master节点查看监听端口：netstat -lntp

18、集群初始化

官方初始化文档：https://kubernetes.io/docs/setup/production-environment/tools/kubeadm/high-availability

Master01节点创建kubeadm-config.yaml配置文件如下：

Master01：（# 注意，如果不是高可用集群，192.168.0.236:16443改为master01的地址，16443改为apiserver的端口，默认是6443，注意更改v1.18.5自己服务器kubeadm的版本：kubeadm version）

注意：以下文件内容，宿主机网段、podSubnet网段、serviceSubnet网段不能重复，具体安装前需要对集群安装网段划分。

apiVersion: kubeadm.k8s.io/v1beta2
bootstrapTokens:
- groups:
  - system:bootstrappers:kubeadm:default-node-token
  token: 7t2weq.bjbawausm0jaxury
  ttl: 24h0m0s
  usages:
  - signing
  - authentication
kind: InitConfiguration
localAPIEndpoint:
  advertiseAddress: 192.168.0.107
  bindPort: 6443
nodeRegistration:
  criSocket: /var/run/dockershim.sock
  name: k8s-master01
  taints:
  - effect: NoSchedule
    key: node-role.kubernetes.io/master
---
apiServer:
  certSANs:
  - 192.168.0.236
  timeoutForControlPlane: 4m0s
apiVersion: kubeadm.k8s.io/v1beta2
certificatesDir: /etc/kubernetes/pki
clusterName: kubernetes
controlPlaneEndpoint: 192.168.0.236:16443
controllerManager: {}
dns:
  type: CoreDNS
etcd:
  local:
    dataDir: /var/lib/etcd
imageRepository: registry.cn-hangzhou.aliyuncs.com/google_containers
kind: ClusterConfiguration
kubernetesVersion: v1.20.0
networking:
  dnsDomain: cluster.local
  podSubnet: 172.168.0.0/12
  serviceSubnet: 10.96.0.0/12
scheduler: {}

更新kubeadm文件

kubeadm config migrate --old-config kubeadm-config.yaml --new-config new.yaml

将new.yaml文件复制到其他master节点，之后所有Master节点提前下载镜像，可以节省初始化时间：

kubeadm config images pull --config /root/new.yaml

所有节点设置开机自启动kubelet

systemctl enable --now kubelet  #（如果启动失败无需管理，初始化成功以后即可启动）

Master01节点初始化，初始化以后会在/etc/kubernetes目录下生成对应的证书和配置文件，之后其他Master节点加入Master01即可：

kubeadm init --config /root/new.yaml  --upload-certs

如果初始化失败，重置后再次初始化，命令如下：

kubeadm reset -f ; ipvsadm --clear  ; rm -rf ~/.kube

初始化成功以后，会产生Token值，用于其他节点加入时使用，因此要记录下初始化成功生成的token值（令牌值）：

Your Kubernetes control-plane has initialized successfully!

To start using your cluster, you need to run the following as a regular user:

  mkdir -p $HOME/.kube
  sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
  sudo chown $(id -u):$(id -g) $HOME/.kube/config

Alternatively, if you are the root user, you can run:

  export KUBECONFIG=/etc/kubernetes/admin.conf

You should now deploy a pod network to the cluster.
Run "kubectl apply -f [podnetwork].yaml" with one of the options listed at:
  https://kubernetes.io/docs/concepts/cluster-administration/addons/

You can now join any number of the control-plane node running the following command on each as root:

  kubeadm join 192.168.0.236:16443 --token 7t2weq.bjbawausm0jaxury \
    --discovery-token-ca-cert-hash sha256:8c92ecb336be2b9372851a9af2c7ca1f7f60c12c68f6ffe1eb513791a1b8a908 \
    --control-plane --certificate-key ac2854de93aaabdf6dc440322d4846fc230b290c818c32d6ea2e500fc930b0aa

Please note that the certificate-key gives access to cluster sensitive data, keep it secret!
As a safeguard, uploaded-certs will be deleted in two hours; If necessary, you can use
"kubeadm init phase upload-certs --upload-certs" to reload certs afterward.

Then you can join any number of worker nodes by running the following on each as root:

kubeadm join 192.168.0.236:16443 --token 7t2weq.bjbawausm0jaxury \
    --discovery-token-ca-cert-hash sha256:8c92ecb336be2b9372851a9af2c7ca1f7f60c12c68f6ffe1eb513791a1b8a908

Master01节点配置环境变量，用于访问Kubernetes集群：

cat <<EOF >> /root/.bashrc
export KUBECONFIG=/etc/kubernetes/admin.conf
EOF
source /root/.bashrc

查看节点状态：

[root@k8s-master01 ~]# kubectl get nodes
NAME           STATUS     ROLES                  AGE   VERSION
k8s-master01   NotReady   control-plane,master   74s   v1.20.0

采用初始化安装方式，所有的系统组件均以容器的方式运行并且在kube-system命名空间内，此时可以查看Pod状态：

[root@k8s-master01 ~]# kubectl get pods -n kube-system -o wide
NAME                                   READY     STATUS    RESTARTS   AGE       IP              NODE
coredns-777d78ff6f-kstsz               0/1       Pending   0          14m       <none>          <none>
coredns-777d78ff6f-rlfr5               0/1       Pending   0          14m       <none>          <none>
etcd-k8s-master01                      1/1       Running   0          14m       192.168.0.107   k8s-master01
kube-apiserver-k8s-master01            1/1       Running   0          13m       192.168.0.107   k8s-master01
kube-controller-manager-k8s-master01   1/1       Running   0          13m       192.168.0.107   k8s-master01
kube-proxy-8d4qc                       1/1       Running   0          14m       192.168.0.107   k8s-master01
kube-scheduler-k8s-master01            1/1       Running   0          13m       192.168.0.107   k8s-master01

19、高可用Master

注意：以下步骤是上述init命令产生的Token过期了才需要执行以下步骤，如果没有过期不需要执行

Token过期后生成新的token：

kubeadm token create –print-join-command

Master需要生成–certificate-key

kubeadm init phase upload-certs  –upload-certs

Token没有过期直接执行Join就行了

初始化其他master加入集群

kubeadm join 192.168.0.236:16443 --token fgtxr1.bz6dw1tci1kbj977     --discovery-token-ca-cert-hash sha256:06ebf46458a41922ff1f5b3bc49365cf3dd938f1a7e3e4a8c8049b5ec5a3aaa5 \
    --control-plane --certificate-key 03f99fb57e8d5906e4b18ce4b737ce1a055de1d144ab94d3cdcf351dfcd72a8b

19、Node节点配置

Node节点上主要部署公司的一些业务应用，生产环境中不建议Master节点部署系统组件之外的其他Pod，测试环境可以允许Master节点部署Pod以节省系统资源。

kubeadm join 192.168.0.236:16443 --token 7t2weq.bjbawausm0jaxury \
    --discovery-token-ca-cert-hash sha256:8c92ecb336be2b9372851a9af2c7ca1f7f60c12c68f6ffe1eb513791a1b8a908

所有节点初始化完成后，查看集群状态

[root@k8s-master01]# kubectl  get node
NAME           STATUS     ROLES                  AGE     VERSION
k8s-master01   NotReady   control-plane,master   8m53s   v1.20.0
k8s-master02   NotReady   control-plane,master   2m25s   v1.20.0
k8s-master03   NotReady   control-plane,master   31s     v1.20.0
k8s-node01     NotReady   <none>                 32s     v1.20.0
k8s-node02     NotReady   <none>                 88s     v1.20.0

20、Calico组件的安装

以下步骤只在master01执行

cd /root/k8s-ha-install && git checkout manual-installation-v1.20.x && cd calico/

修改calico-etcd.yaml的以下位置

sed -i 's#etcd_endpoints: "http://<ETCD_IP>:<ETCD_PORT>"#etcd_endpoints: "https://192.168.0.107:2379,https://192.168.0.108:2379,https://192.168.0.109:2379"#g' calico-etcd.yaml


ETCD_CA=`cat /etc/kubernetes/pki/etcd/ca.crt | base64 | tr -d '\n'`
ETCD_CERT=`cat /etc/kubernetes/pki/etcd/server.crt | base64 | tr -d '\n'`
ETCD_KEY=`cat /etc/kubernetes/pki/etcd/server.key | base64 | tr -d '\n'`
sed -i "s@# etcd-key: null@etcd-key: ${ETCD_KEY}@g; s@# etcd-cert: null@etcd-cert: ${ETCD_CERT}@g; s@# etcd-ca: null@etcd-ca: ${ETCD_CA}@g" calico-etcd.yaml


sed -i 's#etcd_ca: ""#etcd_ca: "/calico-secrets/etcd-ca"#g; s#etcd_cert: ""#etcd_cert: "/calico-secrets/etcd-cert"#g; s#etcd_key: "" #etcd_key: "/calico-secrets/etcd-key" #g' calico-etcd.yaml

POD_SUBNET=`cat /etc/kubernetes/manifests/kube-controller-manager.yaml | grep cluster-cidr= | awk -F= '{print $NF}'`

# 注意下面的这个步骤是把calico-etcd.yaml文件里面的CALICO_IPV4POOL_CIDR下的网段改成自己的Pod网段，也就是把192.168.x.x/16改成自己的集群网段，并打开注释。

所以更改的时候请确保这个步骤的这个网段没有被统一替换掉，如果被替换掉了，还请改回来：

sed -i 's@# - name: CALICO_IPV4POOL_CIDR@- name: CALICO_IPV4POOL_CIDR@g; s@#   value: "192.168.0.0/16"@  value: '"${POD_SUBNET}"'@g' calico-etcd.yaml
kubectl apply -f calico-etcd.yaml

查看容器状态

[root@k8s-master01 calico]# kubectl  get po -n kube-system
NAME                                       READY   STATUS    RESTARTS   AGE
calico-kube-controllers-5f6d4b864b-pwvnb   1/1     Running   0          3m29s
calico-node-5lz9m                          1/1     Running   0          3m29s
calico-node-8z4bg                          1/1     Running   0          3m29s
calico-node-lmzvf                          1/1     Running   0          3m29s
calico-node-mpngv                          1/1     Running   0          3m29s
calico-node-vmqsl                          1/1     Running   0          3m29s
coredns-54d67798b7-8525g                   1/1     Running   0          39m
coredns-54d67798b7-fxs72                   1/1     Running   0          39m
etcd-k8s-master01                          1/1     Running   0          39m
etcd-k8s-master02                          1/1     Running   0          33m
etcd-k8s-master03                          1/1     Running   0          31m
kube-apiserver-k8s-master01                1/1     Running   0          39m
kube-apiserver-k8s-master02                1/1     Running   0          33m
kube-apiserver-k8s-master03                1/1     Running   0          30m
kube-controller-manager-k8s-master01       1/1     Running   1          39m
kube-controller-manager-k8s-master02       1/1     Running   0          33m
kube-controller-manager-k8s-master03       1/1     Running   0          31m
kube-proxy-hnkmj                           1/1     Running   0          39m
kube-proxy-jk4dm                           1/1     Running   0          32m
kube-proxy-nbcg2                           1/1     Running   0          32m
kube-proxy-qv9k7                           1/1     Running   0          32m
kube-proxy-x6xdc                           1/1     Running   0          33m
kube-scheduler-k8s-master01                1/1     Running   1          39m
kube-scheduler-k8s-master02                1/1     Running   0          33m
kube-scheduler-k8s-master03                1/1     Running   0          30m

21、Metrics部署

在新版的Kubernetes中系统资源的采集均使用Metrics-server，可以通过Metrics采集节点和Pod的内存、磁盘、CPU和网络的使用率。

将Master01节点的front-proxy-ca.crt复制到所有Node节点

scp /etc/kubernetes/pki/front-proxy-ca.crt k8s-node01:/etc/kubernetes/pki/front-proxy-ca.crt
scp /etc/kubernetes/pki/front-proxy-ca.crt k8s-node(其他节点自行拷贝):/etc/kubernetes/pki/front-proxy-ca.crt

安装metrics server

cd /root/k8s-ha-install/metrics-server-0.4.x-kubeadm/

[root@k8s-master01 metrics-server-0.4.x-kubeadm]# kubectl  create -f comp.yaml 
serviceaccount/metrics-server created
clusterrole.rbac.authorization.k8s.io/system:aggregated-metrics-reader created
clusterrole.rbac.authorization.k8s.io/system:metrics-server created
rolebinding.rbac.authorization.k8s.io/metrics-server-auth-reader created
clusterrolebinding.rbac.authorization.k8s.io/metrics-server:system:auth-delegator created
clusterrolebinding.rbac.authorization.k8s.io/system:metrics-server created
service/metrics-server created
deployment.apps/metrics-server created
apiservice.apiregistration.k8s.io/v1beta1.metrics.k8s.io created

查看状态

[root@k8s-master01 metrics-server-0.4.x-kubeadm]# kubectl  top node
NAME           CPU(cores)   CPU%   MEMORY(bytes)   MEMORY%   
k8s-master01   109m         2%     1296Mi          33%       
k8s-master02   99m          2%     1124Mi          29%       
k8s-master03   104m         2%     1082Mi          28%       
k8s-node01     55m          1%     761Mi           19%       
k8s-node02     53m          1%     663Mi           17%

22、Dashboard部署

Dashboard用于展示集群中的各类资源，同时也可以通过Dashboard实时查看Pod的日志和在容器中执行一些命令等。

22.1、安装指定版本dashboard

cd /root/k8s-ha-install/dashboard/

[root@k8s-master01 dashboard]# kubectl  create -f .
serviceaccount/admin-user created
clusterrolebinding.rbac.authorization.k8s.io/admin-user created
namespace/kubernetes-dashboard created
serviceaccount/kubernetes-dashboard created
service/kubernetes-dashboard created
secret/kubernetes-dashboard-certs created
secret/kubernetes-dashboard-csrf created
secret/kubernetes-dashboard-key-holder created
configmap/kubernetes-dashboard-settings created
role.rbac.authorization.k8s.io/kubernetes-dashboard created
clusterrole.rbac.authorization.k8s.io/kubernetes-dashboard created
rolebinding.rbac.authorization.k8s.io/kubernetes-dashboard created
clusterrolebinding.rbac.authorization.k8s.io/kubernetes-dashboard created
deployment.apps/kubernetes-dashboard created
service/dashboard-metrics-scraper created
deployment.apps/dashboard-metrics-scraper created

22.2、安装最新版本

官方GitHub地址：https://github.com/kubernetes/dashboard

可以在官方dashboard查看到最新版dashboard

kubectl apply -f https://raw.githubusercontent.com/kubernetes/dashboard/v2.0.3/aio/deploy/recommended.yaml

22.3、创建管理员用户
vim admin.yaml

apiVersion: v1
kind: ServiceAccount
metadata:
  name: admin-user
  namespace: kube-system
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding 
metadata: 
  name: admin-user
  annotations:
    rbac.authorization.kubernetes.io/autoupdate: "true"
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: cluster-admin
subjects:
- kind: ServiceAccount
  name: admin-user
  namespace: kube-system
kubectl apply -f admin.yaml -n kube-system

22.4、登录Dashboard

在谷歌浏览器（Chrome）启动文件中加入启动参数，用于解决无法访问Dashboard的问题，参考图1-1：

--test-type --ignore-certificate-errors

更改dashboard的svc为NodePort：

kubectl edit svc kubernetes-dashboard -n kubernetes-dashboard

将ClusterIP更改为NodePort（如果已经为NodePort忽略此步骤）：

查看端口号：

kubectl get svc kubernetes-dashboard -n kubernetes-dashboard

根据自己的实例端口号，通过任意安装了kube-proxy的宿主机或者VIP的IP+端口即可访问到dashboard：

访问Dashboard：https://192.168.0.236:18282（请更改18282为自己的端口），选择登录方式为令牌（即token方式），参考图1-2

查看token值：

[root@k8s-master01 1.1.1]# kubectl -n kube-system describe secret $(kubectl -n kube-system get secret | grep admin-user | awk '{print $1}')
Name:         admin-user-token-r4vcp
Namespace:    kube-system
Labels:       <none>
Annotations:  kubernetes.io/service-account.name: admin-user
              kubernetes.io/service-account.uid: 2112796c-1c9e-11e9-91ab-000c298bf023

Type:  kubernetes.io/service-account-token

Data
====
ca.crt:     1025 bytes
namespace:  11 bytes
token:      eyJhbGciOiJSUzI1NiIsImtpZCI6IiJ9.eyJpc3MiOiJrdWJlcm5ldGVzL3NlcnZpY2VhY2NvdW50Iiwia3ViZXJuZXRlcy5pby9zZXJ2aWNlYWNjb3VudC9uYW1lc3BhY2UiOiJrdWJlLXN5c3RlbSIsImt1YmVybmV0ZXMuaW8vc2VydmljZWFjY291bnQvc2VjcmV0Lm5hbWUiOiJhZG1pbi11c2VyLXRva2VuLXI0dmNwIiwia3ViZXJuZXRlcy5pby9zZXJ2aWNlYWNjb3VudC9zZXJ2aWNlLWFjY291bnQubmFtZSI6ImFkbWluLXVzZXIiLCJrdWJlcm5ldGVzLmlvL3NlcnZpY2VhY2NvdW50L3NlcnZpY2UtYWNjb3VudC51aWQiOiIyMTEyNzk2Yy0xYzllLTExZTktOTFhYi0wMDBjMjk4YmYwMjMiLCJzdWIiOiJzeXN0ZW06c2VydmljZWFjY291bnQ6a3ViZS1zeXN0ZW06YWRtaW4tdXNlciJ9.bWYmwgRb-90ydQmyjkbjJjFt8CdO8u6zxVZh-19rdlL_T-n35nKyQIN7hCtNAt46u6gfJ5XXefC9HsGNBHtvo_Ve6oF7EXhU772aLAbXWkU1xOwQTQynixaypbRIas_kiO2MHHxXfeeL_yYZRrgtatsDBxcBRg-nUQv4TahzaGSyK42E_4YGpLa3X3Jc4t1z0SQXge7lrwlj8ysmqgO4ndlFjwPfvg0eoYqu9Qsc5Q7tazzFf9mVKMmcS1ppPutdyqNYWL62P1prw_wclP0TezW1CsypjWSVT4AuJU8YmH8nTNR1EXn8mJURLSjINv6YbZpnhBIPgUGk1JYVLcn47w

将token值输入到令牌后，单击登录即可访问
Dashboard，参考图1-3：

23、一些必须的配置更改

将Kube-proxy改为ipvs模式，因为在初始化集群的时候注释了ipvs配置，所以需要自行修改一下：

在master01节点执行

kubectl edit cm kube-proxy -n kube-system
mode: “ipvs”

更新Kube-Proxy的Pod：

kubectl patch daemonset kube-proxy -p "{\"spec\":{\"template\":{\"metadata\":{\"annotations\":{\"date\":\"`date +'%s'`\"}}}}}" -n kube-system

验证Kube-Proxy模式

[root@k8s-master01 1.1.1]# curl 127.0.0.1:10249/proxyMode
ipvs

三、注意事项

注意：kubeadm安装的集群，证书有效期默认是一年。master节点的kube-apiserver、kube-scheduler、kube-controller-manager、etcd都是以容器运行的。可以通过kubectl get po -n kube-system查看。

启动和二进制不同的是：

kubelet的配置文件在/etc/sysconfig/kubelet和/var/lib/kubelet/config.yaml

其他组件的配置文件在/etc/Kubernetes/manifests目录下，比如kube-apiserver.yaml，该yaml文件更改后，kubelet会自动刷新配置，也就是会重启pod。不能再次创建该文件

Kubeadm安装后，master节点默认不允许部署pod，可以通过以下方式打开：

查看Taints：

[root@k8s-master01 ~]# kubectl  describe node -l node-role.kubernetes.io/master=  | grep Taints
Taints:             node-role.kubernetes.io/master:NoSchedule
Taints:             node-role.kubernetes.io/master:NoSchedule
Taints:             node-role.kubernetes.io/master:NoSchedule

####删除Taint：#########
[root@k8s-master01 ~]# kubectl  taint node  -l node-role.kubernetes.io/master node-role.kubernetes.io/master:NoSchedule-
node/k8s-master01 untainted
node/k8s-master02 untainted
node/k8s-master03 untainted
[root@k8s-master01 ~]# kubectl  describe node -l node-role.kubernetes.io/master=  | grep Taints
Taints:             <none>
Taints:             <none>
Taints:             <none>

L2TP/IPsec Server auto install script (CentOS 7)

使用方法

1）新建一个名为*.sh的文件(以l2tp-server.sh为例)，填入以下脚本代码。
2）导入到CentOS7系统任意目录下，然后执行 sh l2tp-server.sh即可自动配置。

#!/usr/bin/env bash
PATH=/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin:~/bin
export PATH

cur_dir=`pwd`

rootness(){
    if [[ $EUID -ne 0 ]]; then
       echo "Error:This script must be run as root!" 1>&2
       exit 1
    fi
}

tunavailable(){
    if [[ ! -e /dev/net/tun ]]; then
        echo "Error:TUN/TAP is not available!" 1>&2
        exit 1
    fi
}

disable_selinux(){
if [ -s /etc/selinux/config ] && grep 'SELINUX=enforcing' /etc/selinux/config; then
    sed -i 's/SELINUX=enforcing/SELINUX=disabled/g' /etc/selinux/config
    setenforce 0
fi
}

get_opsy(){
    [ -f /etc/redhat-release ] && awk '{print ($1,$3~/^[0-9]/?$3:$4)}' /etc/redhat-release && return
    [ -f /etc/os-release ] && awk -F'[= "]' '/PRETTY_NAME/{print $3,$4,$5}' /etc/os-release && return
    [ -f /etc/lsb-release ] && awk -F'[="]+' '/DESCRIPTION/{print $2}' /etc/lsb-release && return
}

get_os_info(){
    IP=$( ip addr | egrep -o '[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}' | egrep -v "^192\.168|^172\.1[6-9]\.|^172\.2[0-9]\.|^172\.3[0-2]\.|^10\.|^127\.|^255\.|^0\." | head -n 1 )
    [ -z ${IP} ] && IP=$( wget -qO- -t1 -T2 myip.ipip.net | egrep -o '[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}')

    local cname=$( awk -F: '/model name/ {name=$2} END {print name}' /proc/cpuinfo | sed 's/^[ \t]*//;s/[ \t]*$//' )
    local cores=$( awk -F: '/model name/ {core++} END {print core}' /proc/cpuinfo )
    local freq=$( awk -F: '/cpu MHz/ {freq=$2} END {print freq}' /proc/cpuinfo | sed 's/^[ \t]*//;s/[ \t]*$//' )
    local tram=$( free -m | awk '/Mem/ {print $2}' )
    local swap=$( free -m | awk '/Swap/ {print $2}' )
    local up=$( awk '{a=$1/86400;b=($1%86400)/3600;c=($1%3600)/60;d=$1%60} {printf("%ddays, %d:%d:%d\n",a,b,c,d)}' /proc/uptime )
    local load=$( w | head -1 | awk -F'load average:' '{print $2}' | sed 's/^[ \t]*//;s/[ \t]*$//' )
    local opsy=$( get_opsy )
    local arch=$( uname -m )
    local lbit=$( getconf LONG_BIT )
    local host=$( hostname )
    local kern=$( uname -r )

    echo "########## System Information ##########"
    echo 
    echo "CPU model            : ${cname}"
    echo "Number of cores      : ${cores}"
    echo "CPU frequency        : ${freq} MHz"
    echo "Total amount of ram  : ${tram} MB"
    echo "Total amount of swap : ${swap} MB"
    echo "System uptime        : ${up}"
    echo "Load average         : ${load}"
    echo "OS                   : ${opsy}"
    echo "Arch                 : ${arch} (${lbit} Bit)"
    echo "Kernel               : ${kern}"
    echo "Hostname             : ${host}"
    echo "IPv4 address         : ${IP}"
    echo 
    echo "########################################"
}


check_sys(){
    local checkType=$1
    local value=$2

    local release=''
    local systemPackage=''

    if [[ -f /etc/redhat-release ]]; then
        release="centos"
        systemPackage="yum"
    elif cat /etc/issue | grep -Eqi "centos|red hat|redhat"; then
        release="centos"
        systemPackage="yum"
    elif cat /proc/version | grep -Eqi "centos|red hat|redhat"; then
        release="centos"
        systemPackage="yum"
    fi

    if [[ ${checkType} == "sysRelease" ]]; then
        if [ "$value" == "$release" ];then
            return 0
        else
            return 1
        fi
    elif [[ ${checkType} == "packageManager" ]]; then
        if [ "$value" == "$systemPackage" ];then
            return 0
        else
            return 1
        fi
    fi
}

versionget(){
    if [[ -s /etc/redhat-release ]];then
        grep -oE  "[0-9.]+" /etc/redhat-release
    else
        grep -oE  "[0-9.]+" /etc/issue
    fi
}

version_check(){
    if check_sys sysRelease centos;then
        local version="`versionget`"
        local main_ver=${version%%.*}        
        if check_sys packageManager yum; then
            if [ "${main_ver}" == "7" ];then
                echo "Current OS version: CentOS ${main_ver} is supported"
                return 0
            else
                echo "Error: CentOS ${main_ver} is not supported, Please re-install OS and try again."
                exit 1
            fi
        fi
    fi
}

preinstall_l2tp(){
    echo
	iprange="192.168.8"
	mypsk="12345678"
	username="test"
	password='test1234'
}

install_l2tp(){

    echo "Adding the EPEL repository..."
    yum -y install epel-release yum-utils
    yum-config-manager --enable epel
    yum -y install ppp libreswan xl2tpd firewalld
    yum_install
}

config_install(){
    cat > /etc/ipsec.conf<<EOF
version 2.0

config setup
    protostack=netkey
    nhelpers=0
    uniqueids=no
    interfaces=%defaultroute
    virtual_private=%v4:10.0.0.0/8,%v4:192.168.0.0/16,%v4:172.16.0.0/12,%v4:!${iprange}.0/24

conn l2tp-psk
    rightsubnet=vhost:%priv
    also=l2tp-psk-nonat

conn l2tp-psk-nonat
    authby=secret
    pfs=no
    auto=add
    keyingtries=3
    rekey=no
    ikelifetime=8h
    keylife=1h
    type=transport
    left=%defaultroute
    leftid=${IP}
    leftprotoport=17/1701
    right=%any
    rightprotoport=17/%any
    dpddelay=40
    dpdtimeout=130
    dpdaction=clear
    sha2-truncbug=yes
EOF

    cat > /etc/ipsec.secrets<<EOF
%any %any : PSK "${mypsk}"
EOF

    cat > /etc/xl2tpd/xl2tpd.conf<<EOF
[global]
port = 1701

[lns default]
ip range = ${iprange}.2-${iprange}.254
local ip = ${iprange}.1
require chap = yes
refuse pap = yes
require authentication = yes
name = l2tpd
ppp debug = yes
pppoptfile = /etc/ppp/options.xl2tpd
length bit = yes
EOF

    cat > /etc/ppp/options.xl2tpd<<EOF
ipcp-accept-local
ipcp-accept-remote
require-mschap-v2
ms-dns 8.8.8.8
ms-dns 8.8.4.4
noccp
auth
hide-password
idle 1800
mtu 1410
mru 1410
nodefaultroute
debug
proxyarp
connect-delay 5000
EOF

    rm -f /etc/ppp/chap-secrets
    cat > /etc/ppp/chap-secrets<<EOF
# Secrets for authentication using CHAP
# client    server    secret    IP addresses
${username}    l2tpd    ${password}       *
EOF

}

yum_install(){

    config_install

    cp -pf /etc/sysctl.conf /etc/sysctl.conf.bak

    echo "# Added by L2TP VPN" >> /etc/sysctl.conf
    echo "net.ipv4.ip_forward=1" >> /etc/sysctl.conf
    echo "net.ipv4.tcp_syncookies=1" >> /etc/sysctl.conf
    echo "net.ipv4.icmp_echo_ignore_broadcasts=1" >> /etc/sysctl.conf
    echo "net.ipv4.icmp_ignore_bogus_error_responses=1" >> /etc/sysctl.conf

    for each in `ls /proc/sys/net/ipv4/conf/`; do
        echo "net.ipv4.conf.${each}.accept_source_route=0" >> /etc/sysctl.conf
        echo "net.ipv4.conf.${each}.accept_redirects=0" >> /etc/sysctl.conf
        echo "net.ipv4.conf.${each}.send_redirects=0" >> /etc/sysctl.conf
        echo "net.ipv4.conf.${each}.rp_filter=0" >> /etc/sysctl.conf
    done
    sysctl -p

    cat > /etc/firewalld/services/xl2tpd.xml<<EOF
<?xml version="1.0" encoding="utf-8"?>
<service>
  <short>xl2tpd</short>
  <description>L2TP IPSec</description>
  <port protocol="udp" port="4500"/>
  <port protocol="udp" port="1701"/>
</service>
EOF
    chmod 640 /etc/firewalld/services/xl2tpd.xml

    systemctl enable ipsec
    systemctl enable xl2tpd
    systemctl enable firewalld

    systemctl status firewalld > /dev/null 2>&1
    if [ $? -eq 0 ]; then
        firewall-cmd --reload
        echo "Checking firewalld status..."
        firewall-cmd --list-all
        echo "add firewalld rules..."
        firewall-cmd --permanent --add-service=ipsec
        firewall-cmd --permanent --add-service=xl2tpd
        firewall-cmd --permanent --add-masquerade
        firewall-cmd --reload
    else
        echo "Firewalld looks like not running, trying to start..."
        systemctl start firewalld
        if [ $? -eq 0 ]; then
            echo "Firewalld start successfully..."
            firewall-cmd --reload
            echo "Checking firewalld status..."
            firewall-cmd --list-all
            echo "adding firewalld rules..."
            firewall-cmd --permanent --add-service=ipsec
            firewall-cmd --permanent --add-service=xl2tpd
            firewall-cmd --permanent --add-masquerade
            firewall-cmd --reload
        else
            echo "Failed to start firewalld. please enable udp port 500 4500 1701 manually if necessary."
        fi
    fi

    systemctl restart ipsec
    systemctl restart xl2tpd
    echo "Checking ipsec status..."
    systemctl -a | grep ipsec
    echo "Checking xl2tpd status..."
    systemctl -a | grep xl2tpd
    echo "Checking firewalld status..."
    firewall-cmd --list-all

}

finally(){

    cd ${cur_dir}
    rm -fr ${cur_dir}/l2tp
    # create l2tp command
    cp -f ${cur_dir}/`basename $0` /usr/bin/l2tp

    echo "Please wait a moment..."
    sleep 5
    ipsec verify
    echo
    echo "If there is no [FAILED] above, you can connect to your L2TP "
    echo "VPN Server with the default Username/Password is below:"
    echo
    echo "Server IP: ${IP}"
    echo "PSK      : ${mypsk}"
    echo "Username : ${username}"
    echo "Password : ${password}"
    echo
    echo "Enjoy it!"
    echo
}


l2tp(){
    clear
    echo
    echo "###############################################################"
    echo "# L2TP VPN Auto Installer                                     #"
    echo "# System Supported: CentOS 7+                                 #"
    echo "###############################################################"
    echo
    rootness
    tunavailable
    disable_selinux
    version_check
    get_os_info
    preinstall_l2tp
    install_l2tp
    finally
}

# Main process
l2tp 2>&1 | tee ${cur_dir}/l2tp.log

Hello,2024

　又到元旦了，时间过得很快，我们也将张开双臂，欣然或者无奈的，迎接这到来的新的一年。

　　在尚离新年很远的时候，每当某个晴好的天，感受到涩涩的、茸茸的冬季阳光抚摸在脸上，总会让人想起这元旦前夜温柔的烛光。窗外，街上已经车水马龙，人来人往。商店的玻璃门前，都已竖起了高高的圣诞树，树上的彩灯也亮了起来，小饰物在灯光的映照下熠熠闪光。而门上，已都贴满了圣诞老人的彩色画像，橱窗上写着纯白色的“圣诞快乐!”，这些字就像是用雪花堆成，闪烁着晶莹的皎洁。而不知何处，已燃起了璀璨的烟花，如霓虹点点，散飞在遥旷的天畔。

　　而在这样的夜，你或者你的朋友，是否已经沉浸在和亲人、友人相聚的幸福之中；还是仍然，穿梭在川流不息的人群，为生活，顾不得这些所谓的节日的快乐，只是随着时间的钟摆摆荡着已无刻意知觉的孤单，和急促的匆忙。

　　其实他人的幸福不必艳羡，或许幸福，仅仅只是一种平和的满足和充实，便已足够。而元旦，就像每个人的生日，除了当事人，他人而言，跟平凡的每天，没什么不同。而若我们一直拥有一颗快乐平和宁静的心，不管哪天，都能过成节日一般。

　　只是这样的夜，这样的节日，还是会禁不住，就如同一颗小石子骤然落在了平镜似水的华年，激起圈圈涟漪，对吗？蒙尘的心，如同被触动了那久久未有振颤的心弦。难免会让人想起那些刹那芳华，似水流年。或许我们会不禁慨叹，新年还是那样的新年、烟花还是那样的璀璨、人潮还是如此的拥挤、自己似乎还是去岁的容颜，可是身旁已没有了一些人儿的陪伴。物是人非，徒留道道追忆。而我们之所以会怀念从前，是因为对往昔太过留恋，可是那曾懵懂阶段的岁月之后，我们都要学会长大，每个人面对自己的使命，都要奔赴至各自的海角天边。生活，注定着一次次的分离，我们也无权将任何人，永远留在身边。而唯有祝福，是最好的惦念。在忙碌之余，多抽个空，打个电话，彼此真诚的相互关怀一下吧，因为一份一如当初的情谊的温暖，真的很难，很难……

　　而这个华诞的夜晚，我站立在窗前，看着呼吸，不断的在玻璃上氤氲出一个个淡淡的雾圈，想起那些过往峥嵘，您的关怀和呵护，让我感动，让我快乐，绮丽的绽放在窗前，让我的这个寒冬，真的好温暖；让我在打下这些文字之时，一点儿都未觉得孤单，困乏………过往的一切一切，点点滴滴，恍如昨日重现，历历眼前……谢谢您，真的，很感谢您。我知道世事无常，流水一般的时光总会难免，残忍的将我们在人海冲散，同时冲散的，还有很多的曾经。但是缘起缘灭，我们不曾强求，我们彼此“感伤着各自的漂泊、读懂着对方的寂寞、相惜着真挚的用情”，如果可能，并时刻珍惜维护着还能继续的陪伴……于是，我们得以释然，并会微笑着对一些人说：你能快乐、幸福，就好。这，就是我最大的心愿。

　　写到这里，抬头仰望星空，那一道道飞舞的烟花就如同一颗颗流星，我愿对着她们，为你们许下心愿。祈愿你们快乐幸福，迈着坚定的步伐，穿行在星星映照的霓虹；不再哭泣，不再埋怨，那些曾经命运的捉弄；祈愿你们转动前程的卷轴，再次放飞，壮志的风筝；背着轻松的行囊，带着一份释怀和平和，无悔无憾的，勇敢前行。

Merry Christmas！！！

时间对于每个人都是公平的，因为每个人每天都只有24小时，每个人都是恒定的，不多也不少。愿意不远千里的来到你的城市，陪你度过这个不一样的节日，那在他的心里，你一定是最重要的。一个愿意为你花钱的男人，不一定爱你，因为他可能有很多很多的钱，钱对他来说不重要，而一个愿意花时间陪你，那他心里一定是很爱你的，因为每天都只有24小时，放弃了其他的事情，挤出了时间来陪你，因为挤出时间来陪你，因为你比所有的事情都重要。

祝大家2023年圣诞节快乐，身体健康。