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02-install_etcd.md

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02-安装etcd集群

kuberntes 集群使用 etcd 存储所有数据,是最重要的组件之一,注意 etcd集群需要奇数个节点(1,3,5...),本文档使用3个节点做集群。

请在另外窗口打开roles/etcd/tasks/main.yml 文件,对照看以下讲解内容。

创建etcd证书

注意:证书是在部署节点创建好之后推送到目标etcd节点上去的,以增加ca证书的安全性

创建ectd证书请求 etcd-csr.json.j2

{
  "CN": "etcd",
  "hosts": [
{% for host in groups['etcd'] %}
    "{{ host }}",
{% endfor %}
    "127.0.0.1"
  ],
  "key": {
    "algo": "rsa",
    "size": 2048
  },
  "names": [
    {
      "C": "CN",
      "ST": "HangZhou",
      "L": "XS",
      "O": "k8s",
      "OU": "System"
    }
  ]
}
  • etcd使用对等证书,hosts 字段必须指定授权使用该证书的 etcd 节点 IP,这里枚举了所有ectd节点的地址

创建etcd 服务文件 etcd.service.j2

[Unit]
Description=Etcd Server
After=network.target
After=network-online.target
Wants=network-online.target
Documentation=https://github.com/coreos

[Service]
Type=notify
WorkingDirectory={{ ETCD_DATA_DIR }}
ExecStart={{ bin_dir }}/etcd \
  --name=etcd-{{ inventory_hostname }} \
  --cert-file={{ ca_dir }}/etcd.pem \
  --key-file={{ ca_dir }}/etcd-key.pem \
  --peer-cert-file={{ ca_dir }}/etcd.pem \
  --peer-key-file={{ ca_dir }}/etcd-key.pem \
  --trusted-ca-file={{ ca_dir }}/ca.pem \
  --peer-trusted-ca-file={{ ca_dir }}/ca.pem \
  --initial-advertise-peer-urls=https://{{ inventory_hostname }}:2380 \
  --listen-peer-urls=https://{{ inventory_hostname }}:2380 \
  --listen-client-urls=https://{{ inventory_hostname }}:2379,http://127.0.0.1:2379 \
  --advertise-client-urls=https://{{ inventory_hostname }}:2379 \
  --initial-cluster-token=etcd-cluster-0 \
  --initial-cluster={{ ETCD_NODES }} \
  --initial-cluster-state={{ CLUSTER_STATE }} \
  --data-dir={{ ETCD_DATA_DIR }} \
  --wal-dir={{ ETCD_WAL_DIR }} \
  --snapshot-count=50000 \
  --auto-compaction-retention=1 \
  --auto-compaction-mode=periodic \
  --max-request-bytes=10485760 \
  --quota-backend-bytes=8589934592
Restart=always
RestartSec=15
LimitNOFILE=65536
OOMScoreAdjust=-999

[Install]
WantedBy=multi-user.target
  • 完整参数列表请使用 etcd --help 查询
  • 注意etcd 即需要服务器证书也需要客户端证书,为方便使用一个peer 证书代替两个证书
  • --initial-cluster-state 值为 new 时,--name 的参数值必须位于 --initial-cluster 列表中
  • --snapshot-count --auto-compaction-retention 一些性能优化参数,请查阅etcd项目文档
  • 设置--data-dir--wal-dir 使用不同磁盘目录,可以避免磁盘io竞争,提高性能,具体请参考etcd项目文档

验证etcd集群状态

  • systemctl status etcd 查看服务状态
  • journalctl -u etcd 查看运行日志
  • 在任一 etcd 集群节点上执行如下命令
# 根据hosts中配置设置shell变量 $NODE_IPS
export NODE_IPS="192.168.1.1 192.168.1.2 192.168.1.3"
for ip in ${NODE_IPS}; do
  ETCDCTL_API=3 etcdctl \
  --endpoints=https://${ip}:2379  \
  --cacert=/etc/kubernetes/ssl/ca.pem \
  --cert=/etc/kubernetes/ssl/etcd.pem \
  --key=/etc/kubernetes/ssl/etcd-key.pem \
  endpoint health; done

for ip in ${NODE_IPS}; do
  ETCDCTL_API=3 etcdctl \
  --endpoints=https://${ip}:2379  \
  --cacert=/etc/kubernetes/ssl/ca.pem \
  --cert=/etc/kubernetes/ssl/etcd.pem \
  --key=/etc/kubernetes/ssl/etcd-key.pem \
  --write-out=table endpoint status; done

预期结果:

https://192.168.1.1:2379 is healthy: successfully committed proposal: took = 2.210885ms
https://192.168.1.2:2379 is healthy: successfully committed proposal: took = 2.784043ms
https://192.168.1.3:2379 is healthy: successfully committed proposal: took = 3.275709ms

三台 etcd 的输出均为 healthy 时表示集群服务正常。

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