二进制安装 kubernetes 1.12(一) - 安装 ETCD
软件环境
软件 | 版本 |
---|---|
操作系统 | CentOS 7.4 |
Docker | 18-ce |
Kubernetes | 1.12 |
服务器角色
角色 | IP | 组件 |
---|---|---|
k8s-master | 192.168.0.205 | kube-apiserver, kuber-controller-manager, kube-scheduler, etcd |
k8s-node1 | 192.168.0.206 | kube-let, kuber-proxy, docker, flannel, etcd |
k8s-node2 | 192.168.0.207 | kube-let, kuber-proxy, docker, flannel, etcd |
架构图
在 master 上安装 ansible 管理集群
yum install ansible -y
# 配置ansible
cat > /etc/ansible/hosts <<EOF
[myhost]
192.168.0.205
[node]
192.168.0.206
192.168.0.207
EOF
# 生成无密码公私钥
cd ~
ssh-keygen -t rsa
# 复制到对应的主机
ssh-copy-id -i ~/.ssh/id_rsa.pub root@192.168.0.205
ssh-copy-id -i ~/.ssh/id_rsa.pub root@192.168.0.206
ssh-copy-id -i ~/.ssh/id_rsa.pub root@192.168.0.207
# 测试 ansible
ansible all -m ping
开放防火墙
ansible all -m shell -a 'firewall-cmd --permanent --add-rich-rule="rule family="ipv4" source address="192.168.0.0/16" accept"'
ansible all -m shell -a 'firewall-cmd --reload'
生成证书
在 k8s-master 上执行
使用cfssl来生成自签证书,先下载cfssl工具:
mkdir /iba/tools -p
cd /iba/tools
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
创建以下三个文件
cat > ca-config.json <<EOF
{
"signing": {
"default": {
"expiry": "87600h"
},
"profiles": {
"www": {
"expiry": "87600h",
"usages": [
"signing",
"key encipherment",
"server auth",
"client auth"
]
}
}
}
}
EOF
ca-config.json:可以定义多个 profiles,分别指定不同的过期时间、使用场景等参数;后续在签名证书时使用某个 profile;
signing:表示该证书可用于签名其它证书;生成的 ca.pem 证书中 CA=TRUE;
server auth:表示client可以用该 CA 对server提供的证书进行验证;
client auth:表示server可以用该CA对client提供的证书进行验证;
cat > ca-csr.json <<EOF
{
"CN": "etcd CA",
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"L": "Beijing",
"ST": "Beijing"
}
]
}
EOF
"CN":Common Name, 组件从证书中提取该字段作为请求的用户名 (User Name);浏览器使用该字段验证网站是否合法;
cat > server-csr.json <<EOF
{
"CN": "etcd",
"hosts": [
"192.168.0.205",
"192.168.0.206",
"192.168.0.207"
],
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"L": "BeiJing",
"ST": "BeiJing"
}
]
}
EOF
生成证书
cfssl gencert -initca ca-csr.json | cfssljson -bare ca -
# 生成了 ca.pem ca-key.pem ca.csr
ca.pem,ca-key.pem,ca.csr 组成了一个自签名的CA机构
证书名称 | 作用 |
---|---|
ca.pem | CA 根证书文件 |
ca-key.pem | 服务端私钥,用于对客户端请求的解密和签名 |
ca.csr | 证书签名请求,用于交叉签名或重新签名 |
cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=www server-csr.json | cfssljson -bare server
# 生成了 server.csr server-key.pem server.pem
部署Etcd
cd /iba/tools
wget https://github.com/etcd-io/etcd/releases/download/v3.2.12/etcd-v3.2.12-linux-amd64.tar.gz
mkdir /opt/etcd/{bin,cfg,ssl} -p
tar zxf etcd-v3.2.12-linux-amd64.tar.gz
mv etcd-v3.2.12-linux-amd64/{etcd,etcdctl} /opt/etcd/bin/
创建etcd配置文件:
cat > /opt/etcd/cfg/etcd <<EOF
#[Member]
ETCD_NAME="etcd01"
ETCD_DATA_DIR="/var/lib/etcd/default.etcd"
ETCD_LISTEN_PEER_URLS="https://192.168.0.205:2380"
ETCD_LISTEN_CLIENT_URLS="https://192.168.0.205:2379"
#[Clustering]
ETCD_INITIAL_ADVERTISE_PEER_URLS="https://192.168.0.205:2380"
ETCD_ADVERTISE_CLIENT_URLS="https://192.168.0.205:2379"
ETCD_INITIAL_CLUSTER="etcd01=https://192.168.0.205:2380,etcd02=https://192.168.0.206:2380,etcd03=https://192.168.0.207:2380"
ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster"
ETCD_INITIAL_CLUSTER_STATE="new"
EOF
备注
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
systemd管理etcd:
cat > /usr/lib/systemd/system/etcd.service <<-'EOF'
[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} \
--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
EOF
把刚才生成的证书拷贝到配置文件中的位置:
cd /iba/tools
cp ca*pem server*pem /opt/etcd/ssl/
把二进制文件和配置文件复制到 nodes 节点上
ansible node -m shell -a 'mkdir /opt/etcd/{bin,cfg,ssl} -p'
cd /opt/etcd/bin/
ansible node -m copy -a 'src=etcd dest=/opt/etcd/bin/'
ansible node -m copy -a 'src=etcdctl dest=/opt/etcd/bin/'
ansible node -m shell -a 'chmod +x /opt/etcd/bin/etcd'
ansible node -m shell -a 'chmod +x /opt/etcd/bin/etcdctl'
cd /opt/etcd/ssl/
ansible node -m copy -a 'src=ca-key.pem dest=/opt/etcd/ssl/'
ansible node -m copy -a 'src=ca.pem dest=/opt/etcd/ssl/'
ansible node -m copy -a 'src=server-key.pem dest=/opt/etcd/ssl/'
ansible node -m copy -a 'src=server.pem dest=/opt/etcd/ssl/'
ansible node -m shell -a 'ls /opt/etcd/ssl/'
ansible node -m copy -a 'src=/opt/etcd/cfg/etcd dest=/opt/etcd/cfg/'
ansible node -m copy -a 'src=/usr/lib/systemd/system/etcd.service dest=/usr/lib/systemd/system/'
修改 node1,node2 上面的 /opt/etcd/cfg/etcd 为对应的值
ETCD_NAME # 修改名称
ETCD_LISTEN_PEER_URLS # 修改IP
ETCD_LISTEN_CLIENT_URLS # 修改IP
ETCD_INITIAL_ADVERTISE_PEER_URLS # 修改IP
ETCD_ADVERTISE_CLIENT_URLS # 修改IP
启动 etcd
ansible node -m shell -a 'systemctl enable etcd'
ansible node -m shell -a 'systemctl start etcd '
检查etcd集群状态
cd /opt/etcd/ssl
/opt/etcd/bin/etcdctl \
--ca-file=ca.pem --cert-file=server.pem --key-file=server-key.pem \
--endpoints="https://192.168.0.205:2379,https://192.168.0.206:2379,https://192.168.0.207:2379" \
cluster-health