mirror of https://github.com/easzlab/kubeasz.git
122 lines
3.7 KiB
Markdown
122 lines
3.7 KiB
Markdown
## 02-安装etcd集群
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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。
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请在另外窗口打开[roles/etcd/tasks/main.yml](../../roles/etcd/tasks/main.yml) 文件，对照看以下讲解内容。
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### 下载etcd/etcdctl 二进制文件、创建证书目录
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https://github.com/etcd-io/etcd/releases
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### 创建etcd证书请求 [etcd-csr.json.j2](../../roles/etcd/templates/etcd-csr.json.j2)
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``` bash
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{
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"CN": "etcd",
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"hosts": [
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"127.0.0.1",
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"{{ inventory_hostname }}"
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],
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"key": {
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"algo": "rsa",
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"size": 2048
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},
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"names": [
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{
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"C": "CN",
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"ST": "HangZhou",
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"L": "XS",
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"O": "k8s",
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"OU": "System"
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}
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]
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}
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```
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+ 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
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### 创建证书和私钥
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``` bash
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cd /etc/etcd/ssl && {{ bin_dir }}/cfssl gencert \
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-ca={{ ca_dir }}/ca.pem \
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-ca-key={{ ca_dir }}/ca-key.pem \
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-config={{ ca_dir }}/ca-config.json \
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-profile=kubernetes etcd-csr.json | {{ bin_dir }}/cfssljson -bare etcd
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```
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### 创建etcd 服务文件 [etcd.service.j2](../../roles/etcd/templates/etcd.service.j2)
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先创建工作目录 /var/lib/etcd/
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``` bash
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[Unit]
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Description=Etcd Server
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After=network.target
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After=network-online.target
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Wants=network-online.target
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Documentation=https://github.com/coreos
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[Service]
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Type=notify
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WorkingDirectory=/var/lib/etcd/
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ExecStart={{ bin_dir }}/etcd \
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--name={{ NODE_NAME }} \
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--cert-file=/etc/etcd/ssl/etcd.pem \
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--key-file=/etc/etcd/ssl/etcd-key.pem \
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--peer-cert-file=/etc/etcd/ssl/etcd.pem \
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--peer-key-file=/etc/etcd/ssl/etcd-key.pem \
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--trusted-ca-file={{ ca_dir }}/ca.pem \
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--peer-trusted-ca-file={{ ca_dir }}/ca.pem \
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--initial-advertise-peer-urls=https://{{ inventory_hostname }}:2380 \
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--listen-peer-urls=https://{{ inventory_hostname }}:2380 \
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--listen-client-urls=https://{{ inventory_hostname }}:2379,http://127.0.0.1:2379 \
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--advertise-client-urls=https://{{ inventory_hostname }}:2379 \
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--initial-cluster-token=etcd-cluster-0 \
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--initial-cluster={{ ETCD_NODES }} \
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--initial-cluster-state=new \
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--data-dir=/var/lib/etcd
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Restart=on-failure
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RestartSec=5
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LimitNOFILE=65536
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[Install]
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WantedBy=multi-user.target
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```
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+ 完整参数列表请使用 `etcd --help` 查询
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+ 注意etcd 即需要服务器证书也需要客户端证书，这里为方便使用一个peer 证书代替两个证书，更多证书相关请阅读 [01-创建CA证书和环境配置](01-CA_and_prerequisite.md)
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+ `--initial-cluster-state` 值为 `new` 时，`--name` 的参数值必须位于 `--initial-cluster` 列表中；
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### 启动etcd服务
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``` bash
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systemctl daemon-reload && systemctl enable etcd && systemctl start etcd
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```
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### 验证etcd集群状态
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+ systemctl status etcd 查看服务状态
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+ journalctl -u etcd 查看运行日志
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+ 在任一 etcd 集群节点上执行如下命令
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``` bash
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# 根据hosts中配置设置shell变量 $NODE_IPS
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export NODE_IPS="192.168.1.1 192.168.1.2 192.168.1.3"
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for ip in ${NODE_IPS}; do
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ETCDCTL_API=3 etcdctl \
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--endpoints=https://${ip}:2379 \
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--cacert=/etc/kubernetes/ssl/ca.pem \
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--cert=/etc/etcd/ssl/etcd.pem \
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--key=/etc/etcd/ssl/etcd-key.pem \
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endpoint health; done
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```
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预期结果：
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``` text
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https://192.168.1.1:2379 is healthy: successfully committed proposal: took = 2.210885ms
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https://192.168.1.2:2379 is healthy: successfully committed proposal: took = 2.784043ms
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https://192.168.1.3:2379 is healthy: successfully committed proposal: took = 3.275709ms
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```
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三台 etcd 的输出均为 healthy 时表示集群服务正常。
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[后一篇](03-install_docker.md)
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