mirror of https://github.com/easzlab/kubeasz.git
更新02-安装etcd集群.md
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文档基于`Ubuntu 16.04`,其他系统如`CentOS 7`需要读者自行替换部分命令;由于使用经验有限和简化脚本考虑,已经尽量避免`ansible-playbook`的高级特性和复杂逻辑。
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你可能需要掌握基本`kubernetes` `docker` `linux shell` 知识,关于`ansible`建议阅读 [ansible超快入门](http://weiweidefeng.blog.51cto.com/1957995/1895261) 基本够用。
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欢迎提`Issues`和`PRs`参与维护项目。
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## 组件版本
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1. 建议阅读 [feisky.gitbooks](https://feisky.gitbooks.io/kubernetes/) 原理和部署章节。
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1. 建议阅读 [opsnull教程](https://github.com/opsnull/follow-me-install-kubernetes-cluster) 二进制手工部署。
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1. 建议阅读 [ansible超快入门](http://weiweidefeng.blog.51cto.com/1957995/1895261) 基本够用。
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## 版权
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@ -48,6 +49,6 @@ Copyright 2017 gjmzj (jmgaozz@163.com)
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Apache License 2.0,详情见 [LICENSE](LICENSE) 文件。
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如果你觉得这份文档对你有帮助,请支付宝扫描下方的二维码进行捐赠,谢谢!
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如果觉得这份文档对你有帮助,请支付宝扫描下方的二维码进行捐赠,谢谢!
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![donate](./pics/alipay.png)
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@ -60,7 +60,7 @@ kubernetes 系统各组件需要使用 TLS 证书对通信进行加密,使用
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#### 生成CA 证书和私钥
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``` bash
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cd {{ ca_dir }} && {{ bin_dir }}/cfssl gencert -initca ca-csr.json | {{ bin_dir }}/cfssljson -bare ca
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cfssl gencert -initca ca-csr.json | cfssljson -bare ca
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```
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+ 注意整个集群只能有一个CA证书和配置文件,所以下一步要分发给每一个节点,包括calico/node也需要使用
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## 02-安装etcd集群.md
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``` bash
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roles/etcd
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├── tasks
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│ └── main.yml
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└── templates
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├── etcd-csr.json.j2
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└── etcd.service.j2
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```
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kuberntes 系统使用 etcd 存储所有数据,是最重要的组件之一,注意 etcd集群只能有奇数个节点(1,3,5...),本文档使用3个节点做集群。
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按照[roles/etcd/tasks/main.yml](../roles/etcd/tasks/main.yml) 下载etcd/etcdctl 二进制文件、创建证书目录
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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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"{{ NODE_IP }}"
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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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+ hosts 字段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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+ 因为证书是在**etcd**节点生成的,所以要用ansible 模块`fetch` 把证书传送到**deploy**节点,以便后续再通过**deploy**节点传送到**calico/node**节点
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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://{{ NODE_IP }}:2380 \
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--listen-peer-urls=https://{{ NODE_IP }}:2380 \
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--listen-client-urls=https://{{ NODE_IP }}:2379,http://127.0.0.1:2379 \
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--advertise-client-urls=https://{{ NODE_IP }}: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{{ }} 中的参数与ansible hosts文件中设置对应
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+ 为了保证通信安全,需要指定 etcd 的公私钥(cert-file和key-file)、Peers 通信的公私钥和 CA 证书(peer-cert-file、peer-key-file、peer-trusted-ca-file)、客户端的CA证书(trusted-ca-file);
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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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部署完 etcd 集群后,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 ${NODE_IPS}; do
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ETCDCTL_API=3 /root/local/bin/etcdctl \
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--endpoints=https://${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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