二进制方式安装高可用etcd集群

机器准备

节点名称	IP
etcd01	192.168.1.101
etcd02	192.168.1.102
etcd03	192.168.1.103

安装证书生成工具cfssl

mkdir -p /opt/cfssl
cd /opt/cfssl

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

生成key

创建目录

mkdir -p /opt/ssl/etcd
cd /opt/ssl/etcd

ca-config.json

cat > ca-config.json <<EOF
{
"signing": {
  "default": {
    "expiry": "87600h"
  },
  "profiles": {
    "www": {
       "expiry": "87600h",
       "usages": [
          "signing",
          "key encipherment",
          "server auth",
          "client auth"
      ]
    }
  }
}
}
EOF

ca-csr.json

cat > ca-csr.json <<EOF
{
  "CN": "etcd CA",
  "key": {
      "algo": "rsa",
      "size": 2048
  },
  "names": [
      {
          "C": "CN",
          "L": "Beijing",
          "ST": "Beijing"
      }
  ]
}
EOF

server-csr.json

cat > server-csr.json <<EOF
{
  "CN": "etcd",
  "hosts": [
  "192.168.1.101",
  "192.168.1.102",
  "192.168.1.103"
  ],
  "key": {
      "algo": "rsa",
      "size": 2048
  },
  "names": [
      {
          "C": "CN",
          "L": "BeiJing",
          "ST": "BeiJing"
      }
  ]
}
EOF

生成证书(ca-key.pem ca.pem server-key.pem server.pem)

cfssl gencert -initca ca-csr.json | cfssljson -bare ca -
cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=www server-csr.json | cfssljson -bare server

部署etcd

3个节点都操作

下载

mkdir -p /opt/etcd/src
cd /opt/etcd/src
tar -zvxf etcd-v3.3.17-linux-amd64.tar.gz
mkdir -p /opt/etcd/{bin,cfg,ssl}
mv etcd-v3.3.17-linux-amd64/{etcd,etcdctl} /opt/etcd/bin/

添加etcd配置文件
3台机器ETCD_NAME名字不一样，本机IP不一样
```
vim /opt/etcd/cfg/etcd
```
#[Member]
```
ETCD_NAME="etcd01"
ETCD_DATA_DIR="/var/lib/etcd/default.etcd"
ETCD_LISTEN_PEER_URLS="https://192.168.1.101:2380"
ETCD_LISTEN_CLIENT_URLS="https://192.168.1.101:2379"
```
#[Clustering]
```
ETCD_INITIAL_ADVERTISE_PEER_URLS="https://192.168.1.101:2380"
ETCD_ADVERTISE_CLIENT_URLS="https://192.168.101.1:2379"
ETCD_INITIAL_CLUSTER="etcd01=https://192.168.1.101:2380,etcd02=https://192.168.1.102:2380,etcd03=https://192.168.1.103:2380"
ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster"
ETCD_INITIAL_CLUSTER_STATE="new"
```
ETCD_NAME 节点名称
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_PEER_URLS 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_INITIAL_CLUSTER_TOKEN 集群Token
ETCD_INITIAL_CLUSTER_STATE 加入集群的当前状态，new是新集群，existing表示加入已有集群

添加etcd.service

vim /usr/lib/systemd/system/etcd.service

[Unit]
Description=Etcd Server
After=network.target
After=network-online.target
Wants=network-online.target

[Service]
Type=notify
EnvironmentFile=/opt/etcd/cfg/etcd
ExecStart=/opt/etcd/bin/etcd \
--name=${ETCD_NAME} \
--data-dir=${ETCD_DATA_DIR} \
--listen-peer-urls=${ETCD_LISTEN_PEER_URLS} \
--listen-client-urls=${ETCD_LISTEN_CLIENT_URLS},http://127.0.0.1:2379 \
--advertise-client-urls=${ETCD_ADVERTISE_CLIENT_URLS} \
--initial-advertise-peer-urls=${ETCD_INITIAL_ADVERTISE_PEER_URLS} \
--initial-cluster=${ETCD_INITIAL_CLUSTER} \
--initial-cluster-token=${ETCD_INITIAL_CLUSTER_TOKEN} \
--initial-cluster-state=new \
--cert-file=/opt/etcd/ssl/server.pem \
--key-file=/opt/etcd/ssl/server-key.pem \
--peer-cert-file=/opt/etcd/ssl/server.pem \
--peer-key-file=/opt/etcd/ssl/server-key.pem \
--trusted-ca-file=/opt/etcd/ssl/ca.pem \
--peer-trusted-ca-file=/opt/etcd/ssl/ca.pem
Restart=on-failure
LimitNOFILE=65536

[Install]
WantedBy=multi-user.target

复制证书文件

cp /opt/ssl/etcd/ca*pem  /opt/etcd/ssl/
cp /opt/ssl/etcd/server*pem  /opt/etcd/ssl/
scp /opt/ssl/etcd/ca*pem  root@192.168.1.102:/opt/etcd/ssl/
scp /opt/ssl/etcd/ca*pem  root@192.168.1.102:/opt/etcd/ssl/
scp /opt/ssl/etcd/server*pem  root@192.168.1.103:/opt/etcd/ssl/
scp /opt/ssl/etcd/server*pem  root@192.168.1.103:/opt/etcd/ssl/

启动

systemctl enable etcd
systemctl start etcd

检查

cd /opt/ssl/etcd/
/opt/etcd/bin/etcdctl --ca-file=ca.pem --cert-file=server.pem --key-file=server-key.pem --endpoints="https://192.168.1.101:2379,https://192.168.1.102:2379,https://192.168.1.103:2379" cluster-health

出现如下信息，则安装成功

member 65f49728d3d54972 is healthy: got healthy result from https://192.168.1.101:2379
member d94ba21c17c75ffb is healthy: got healthy result from https://192.168.1.102:2379
member dc51f874259f7894 is healthy: got healthy result from https://192.168.1.103:2379
cluster is healthy

查看日志

tail -f /var/log/messages
journalctl -u etcd

备份

ETCDCTL_API=3 etcdctl --endpoints https://127.0.0.1:2379 211 --cacert=/etc/kubernetes/pki/etcd/ca.crt --cert=/etc/kubernetes/pki/etcd/server.crt --key=/etc/kubernetes/pki/etcd/server.key snapshot save /tmp/snapshot-pre-boot.db

恢复

将上面的备份文件的数据恢复到 /var/lib/etcd-from-backup 下，然后将etcd的数据目录指向新的目录即可

ETCDCTL_API=3 etcdctl --endpoints=https://127.0.0.1:2379 --cacert=/etc/kubernetes/pki/etcd/ca.crt --cert=/etc/kubernetes/pki/etcd/server.crt --key=/etc/kubernetes/pki/etcd/server.key snapshot restore /tmp/snapshot-pre-boot.db --data-dir /var/lib/etcd-from-backup

etcd

二进制方式安装高可用etcd集群

机器准备

安装证书生成工具cfssl

生成key

部署etcd

备份

恢复

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