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概述
etcd 是兼具一致性和高可用性的键值数据库，可以作为保存 Kubernetes 所有集群数据的后台数据库。
- 官方网址：
Documentation versions | etcd
准备cfssl证书生成工具
cfssl是一个开源的证书管理工具，使用json文件生成证书.
在任意一台服务器上操作，这里选择k8s01
wget https://pkg.cfssl.org/R1.2/cfssl_linux-amd64
wget https://pkg.cfssl.org/R1.2/cfssljson_linux-amd64
wget https://pkg.cfssl.org/R1.2/cfssl-certinfo_linux-amd64
chmod +x cfssl_linux-amd64 cfssljson_linux-amd64 cfssl-certinfo_linux-amd64
mv cfssl_linux-amd64 /usr/local/bin/cfssl
mv cfssljson_linux-amd64 /usr/local/bin/cfssljson
mv cfssl-certinfo_linux-amd64 /usr/bin/cfssl-certinfo创建etcd相关目录
$ mkdir -pv /opt/kubernetes/etcd/{bin,cfg,ssl,data}创建证书
4.1 创建ca证书json文件
$ cd /opt/kubernetes/etcd/ssl# 创建ca-config
$ vim ca-config.json
{"signing": {"default": {"expiry": "87600h"},"profiles": {"www": {"expiry": "87600h","usages": ["signing","key encipherment","server auth","client auth"]}}}
}# 创建ca-csr
$ vim ca-csr.json
{"CN": "etcd CA","key": {"algo": "rsa","size": 2048},"names": [{"C": "CN","L": "Beijing","ST": "Beijing"}]
}4.2 生成ca证书
$ cfssl gencert -initca ca-csr.json | cfssljson -bare ca -4.3 使用自签ca签发etcd证书
创建证书申请文件：
$ cd /opt/kubernetes/etcd/ssl# 注意hosts内容，etcd集群内的ip都要写上，可以预留几个，为以后扩容使用
{"CN": "etcd","hosts": ["10.10.21.73","10.10.21.74","10.10.21.75"],"key": {"algo": "rsa","size": 2048},"names": [{"C": "CN","L": "BeiJing","ST": "BeiJing"}]
}生成证书
$ cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=www server-csr.json | cfssljson -bare server
# 会生成server.pem和server-key.pem文件
$ ll |grep server
-rw-r--r-- 1 root root 1013 Sep 14 15:06 server.csr
-rw-r--r-- 1 root root 290 Sep 14 15:05 server-csr.json
-rw------- 1 root root 1679 Sep 14 15:06 server-key.pem
-rw-r--r-- 1 root root 1338 Sep 14 15:06 server.pem下载etcd二进制文件
下载地址
https://github.com/etcd-io/etcd/releases/download/v3.5.0/etcd-v3.5.0-linux-amd64.tar.gz
部署ETCD集群
6.1 复制二进制文件到指定文件
tar xf etcd-v3.5.0-linux-amd64.tar.gz
cp etcd-v3.5.0-linux-amd64/{etcd,etcdctl,etcdutl} /opt/kubernetes/etcd/bin6.2 创建etcd配置文件
$vim /opt/kubernetes/etcd/cfg/etcd.conf
#[Member]
ETCD_NAME="etcd-1" # k8s01为etcd-1，k8s02为etcd-2。。。每个节点唯一标识符
ETCD_DATA_DIR="/opt/kubernetes/etcd/data/default.etcd"
ETCD_LISTEN_PEER_URLS="https://192.168.1.241:2380" # 修改对应ip，k8s01为241，k8s02为242...
ETCD_LISTEN_CLIENT_URLS="https://192.168.1.241:2379" # 修改对应ip，k8s01为241，k8s02为242...#[Clustering]
ETCD_INITIAL_ADVERTISE_PEER_URLS="https://192.168.1.241:2380" # 修改对应ip，k8s01为241，k8s02为242...
ETCD_ADVERTISE_CLIENT_URLS="https://192.168.1.241:2379" # 修改对应ip，k8s01为241，k8s02为242...
ETCD_INITIAL_CLUSTER="etcd-1=https://192.168.1.241:2380,etcd-2=https://192.168.1.242:2380,etcd-3=https://192.168.1.243:2380"
ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster"
ETCD_INITIAL_CLUSTER_STATE="new"注释：
ETCD_NAME：节点名称，集群中唯一
ETCD_DATA_DIR：数据目录
ETCD_LISTEN_PEER_URLS：集群通信监听地址
ETCD_LISTEN_CLIENT_URLS：客户端访问监听地址
ETCD_INITIAL_ADVERTISE_PEERURLS：集群通告地址
ETCD_ADVERTISE_CLIENT_URLS：客户端通告地址
ETCD_INITIAL_CLUSTER：集群节点地址
ETCD_INITIALCLUSTER_TOKEN：集群Token
ETCD_INITIALCLUSTER_STATE：加入集群的当前状态，new是新集群，existing表示加入已有集群
6.3 创建systemd文件
$ vim /etc/systemd/system/etcd.service
[Unit]
Description=Etcd Server
After=network.target
After=network-online.target
Wants=network-online.targe[Service]
Type=notify
EnvironmentFile=/opt/kubernetes/etcd/cfg/etcd.conf
ExecStart=/opt/kubernetes/etcd/bin/etcd \
--cert-file=/opt/kubernetes/etcd/ssl/server.pem \
--key-file=/opt/kubernetes/etcd/ssl/server-key.pem \
--peer-cert-file=/opt/kubernetes/etcd/ssl/server.pem \
--peer-key-file=/opt/kubernetes/etcd/ssl/server-key.pem \
--trusted-ca-file=/opt/kubernetes/etcd/ssl/ca.pem \
--peer-trusted-ca-file=/opt/kubernetes/etcd/ssl/ca.pem \
--logger=zap
Restart=on-failure
LimitNOFILE=65536[Install]
WantedBy=multi-user.target分发etcd文件
node02
$ scp -r /opt/kubernetes k8s02:/opt/
$ scp /etc/systemd/system/etcd.service k8s02:/etc/systemd/system/
# 记得修改etcd配置文件node03
$ scp -r /opt/kubernetes k8s03:/opt/
$ scp /etc/systemd/system/etcd.service k8s03:/etc/systemd/system/
# 记得修改etcd配置文件8. 分别启动etcd服务
$ systemctl start etcd.service查看集群状态
[root@kubenode01 etcd]# ./bin/etcdctl --cacert=/opt/kubernetes/etcd/ssl/ca.pem --cert=/opt/kubernetes/etcd/ssl/server.pem --key=/opt/kubernetes/etcd/ssl/server-key.pem --endpoints="https://10.10.21.73:2379,https://10.10.21.74:2379,https://10.10.21.75:2379" endpoint health --write-out=table+--------------------------+--------+-------------+-------+
| ENDPOINT | HEALTH | TOOK | ERROR |
+--------------------------+--------+-------------+-------+
| https://10.10.21.75:2379 | true | 13.407895ms | |
| https://10.10.21.74:2379 | true | 13.61133ms | |
| https://10.10.21.73:2379 | true | 14.868649ms | |
+--------------------------+--------+-------------+-------+9. 测试
写入数据
[root@kubenode01 etcd]# ./bin/etcdctl --cacert=/opt/kubernetes/etcd/ssl/ca.pem --cert=/opt/kubernetes/etcd/ssl/server.pem --key=/opt/kubernetes/etcd/ssl/server-key.pem --endpoints="https://10.10.21.73:2379,https://10.10.21.74:2379,https://10.10.21.75:2379" put foo bar
OK读取数据
[root@kubenode02 etcd]# ./bin/etcdctl --cacert=/opt/kubernetes/etcd/ssl/ca.pem --cert=/opt/kubernetes/etcd/ssl/server.pem --key=/opt/kubernetes/etcd/ssl/server-key.pem --endpoints="https://10.10.21.73:2379,https://10.10.21.74:2379,https://10.10.21.75:2379" get foo
foo
bar