安装 etcd

准备环境

使能 etcd 使用的端口:

firewall-cmd --zone=public --add-port=2379/tcp
firewall-cmd --zone=public --add-port=2380/tcp

安装 etcd 二进制

当前是通过 rpm 包安装

rpm -ivh etcd*.rpm

准备目录

mkdir -p /etc/etcd /var/lib/etcd
cp ca.pem /etc/etcd/
cp kubernetes-key.pem /etc/etcd/
cp kubernetes.pem /etc/etcd/
# 关闭selinux
setenforce 0
# 禁用/etc/etcd/etcd.conf文件的默认配置
# 注释掉即可,例如:ETCD_LISTEN_CLIENT_URLS="http://localhost:2379"

编写 etcd.service 文件

k8smaster0 机器为例:

$ cat /usr/lib/systemd/system/etcd.service
[Unit]
Description=Etcd Server
After=network.target
After=network-online.target
Wants=network-online.target

[Service]
Type=notify
WorkingDirectory=/var/lib/etcd/
EnvironmentFile=-/etc/etcd/etcd.conf
# set GOMAXPROCS to number of processors
ExecStart=/bin/bash -c "ETCD_UNSUPPORTED_ARCH=arm64 /usr/bin/etcd --name=k8smaster0 --cert-file=/etc/etcd/kubernetes.pem --key-file=/etc/etcd/kubernetes-key.pem --peer-cert-file=/etc/etcd/kubernetes.pem --peer-key-file=/etc/etcd/kubernetes-key.pem --trusted-ca-file=/etc/etcd/ca.pem --peer-trusted-ca-file=/etc/etcd/ca.pem --peer-client-cert-auth --client-cert-auth --initial-advertise-peer-urls https://192.168.122.154:2380 --listen-peer-urls https://192.168.122.154:2380 --listen-client-urls https://192.168.122.154:2379,https://127.0.0.1:2379 --advertise-client-urls https://192.168.122.154:2379 --initial-cluster-token etcd-cluster-0 --initial-cluster k8smaster0=https://192.168.122.154:2380,k8smaster1=https://192.168.122.155:2380,k8smaster2=https://192.168.122.156:2380 --initial-cluster-state new --data-dir /var/lib/etcd"

Restart=always
RestartSec=10s
LimitNOFILE=65536

[Install]
WantedBy=multi-user.target

注意:

  • arm64上面需要增加启动设置ETCD_UNSUPPORTED_ARCH=arm64
  • 由于本文把etcd和k8s control部署在相同机器,所以使用了kubernetes.pemkubernetes-key.pem证书来启动;
  • ca证书,在整个部署流程里面使用了一个,etcd可以生成自己的ca,然后用自己的ca签名其他证书,但是需要在apiserver访问etcd的client用该ca签名的证书;
  • initial-cluster需要把所有部署etcd的配置加上;
  • 为了提高etcd的存储效率,可以使用ssd硬盘的目录,作为data-dir

启动服务

$ systemctl enable etcd
$ systemctl start etcd

然后,依次部署其他机器即可。

验证基本功能

$  ETCDCTL_API=3 etcdctl -w table endpoint status --endpoints=https://192.168.122.155:2379,https://192.168.122.156:2379,https://192.168.122.154:2379   --cacert=/etc/etcd/ca.pem   --cert=/etc/etcd/kubernetes.pem   --key=/etc/etcd/kubernetes-key.pem
+------------------------------+------------------+---------+---------+-----------+------------+-----------+------------+--------------------+--------+
|           ENDPOINT           |        ID        | VERSION | DB SIZE | IS LEADER | IS LEARNER | RAFT TERM | RAFT INDEX | RAFTAPPLIED INDEX | ERRORS |
+------------------------------+------------------+---------+---------+-----------+------------+-----------+------------+--------------------+--------+
| https://192.168.122.155:2379 | b50ec873e253ebaa |  3.4.14 |  262 kB |     false |      false |       819 |         21 |           21 |        |
| https://192.168.122.156:2379 | e2b0d126774c6d02 |  3.4.14 |  262 kB |      true |      false |       819 |         21 |           21 |        |
| https://192.168.122.154:2379 | f93b3808e944c379 |  3.4.14 |  328 kB |     false |      false |       819 |         21 |           21 |        |
+------------------------------+------------------+---------+---------+-----------+------------+-----------+------------+--------------------+--------+
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