Role assignment:

Environmental deployment

All virtual machines have turned off the firewall and selinux core protection functions

Practical operation

Build working directory to store binary software package

[root@master ~]# cd /
[root@master /]# mkdir k8s

Install ETCD database (three copy mechanism)
master (download the ca Certificate creation and management tool cfssl)

[root@master k8s]# curl -L https://pkg.cfssl.org/R1.2/cfssl_linux-amd64 -o /usr/local/bin/cfssl
[root@master k8s]# curl -L https://pkg.cfssl.org/R1.2/cfssljson_linux-amd64 -o /usr/local/bin/cfssljson
[root@master k8s]# curl -L https://pkg.cfssl.org/R1.2/cfssl-certinfo_linux-amd64 -o /usr/local/bin/cfssl-certinfo
[root@master k8s]# chmod +x /usr/local/bin/cfssl /usr/local/bin/cfssljson /usr/local/bin/cfssl-certinfo

Generate ca certificate

//Define ca certificate and generate ca certificate configuration file
[root@master k8s]# cat > ca-config.json <<EOF
{
  "signing": {
    "default": {
      "expiry": "87600h"
    },
    "profiles": {
      "www": {
         "expiry": "87600h",
         "usages": [
            "signing",
            "key encipherment",
            "server auth",
            "client auth"
        ]
      }
    }
  }
}
EOF

//Generate certificate signature file
[root@master k8s]# cat > ca-csr.json <<EOF
{
    "CN": "etcd CA",
    "key": {
        "algo": "rsa",
        "size": 2048
    },
    "names": [
        {
            "C": "CN",
            "L": "Beijing",
            "ST": "Beijing"
        }
    ]
}
EOF

//Generate CA certificate, ca.pem, CA key.pem
[root@master k8s]# cfssl gencert -initca ca-csr.json | cfssljson -bare ca -

[root@master k8s]# ls
ca-config.json  ca-csr.json  ca.pem   ca.csr     ca-key.pem   
"ca.pem"         //ca certificate file
"ca-key.pem"         //ca key certificate file

Generate the communication certificate between each node of etcd (note the change of IP address)

//Generate communication verification signature between etcd nodes
//Node address must be changed
[root@master k8s]# cat > server-csr.json <<EOF
{
    "CN": "etcd",
    "hosts": [
    "192.168.142.220",
    "192.168.142.136",
    "192.168.142.132"
    ],
    "key": {
        "algo": "rsa",
        "size": 2048
    },
    "names": [
        {
            "C": "CN",
            "L": "BeiJing",
            "ST": "BeiJing"
        }
    ]
}
EOF

//Generate etcd Communication Certificate for etcd communication verification
[root@master k8s]# cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=www server-csr.json | cfssljson -bare server

[root@master k8s]# ls
ca-config.json  ca-csr.json  ca.pem        server.csr       server-key.pem
ca.csr          ca-key.pem   etcd-cert.sh  server-csr.json  server.pem
"server.pem"&"server-key.pem"      //Verification certificate of communication between etcd s

Configure etcd binaries

//Unzip and install etcd
[root@master k8s]# tar zxf etcd-v3.3.10-linux-amd64.tar.gz

//Establish a directory to store etcd configuration files, commands and certificates
[root@master k8s]# mkdir -p /opt/etcd/{cfg,bin,ssl}
[root@master k8s]# ls /opt/etcd/
bin  cfg  ssl

//Storing files in etcd by category
[root@master k8s]# mv etcd-v3.3.10-linux-amd64/etcd /opt/etcd/bin/
[root@master k8s]# mv etcd-v3.3.10-linux-amd64/etcdctl /opt/etcd/bin/
[root@master k8s]# cp -p *.pem /opt/etcd/ssl/

//etcd command file
[root@master k8s]# ls /opt/etcd/bin/
etcd  etcdctl

//etcd certificate
[root@master k8s]# ls /opt/etcd/ssl/
ca-key.pem  ca.pem  server-key.pem  server.pem

Create etcd profile

[root@master k8s]# cat <<EOF >/opt/etcd/cfg/etcd
//[Member]
ETCD_NAME="etcd01"
ETCD_DATA_DIR="/var/lib/etcd/default.etcd"
ETCD_LISTEN_PEER_URLS="https://192.168.142.220:2380"
ETCD_LISTEN_CLIENT_URLS="https://192.168.142.220:2379"

//[Clustering]
ETCD_INITIAL_ADVERTISE_PEER_URLS="https://192.168.142.220:2380"
ETCD_ADVERTISE_CLIENT_URLS="https://192.168.142.220:2379"
ETCD_INITIAL_CLUSTER="etcd01=https://192.168.142.220:2380,etcd02=https://192.168.142.136:2380,etcd03=https://192.168.142.132:2380"
ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster"
ETCD_INITIAL_CLUSTER_STATE="new"
EOF

Create etcd startup script

[root@master k8s]# cat <<EOF >/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=etcd01 \
--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
EOF

Push certificate, configuration file, startup script to node

//Push certificates and configuration files to other nodes
[root@master ~]# scp -r /opt/etcd/ root@192.168.142.136:/opt/
[root@master ~]# scp -r /opt/etcd/ root@192.168.142.132:/opt/

//Push start script
[root@master ~]# scp /usr/lib/systemd/system/etcd.service root@192.168.142.136:/usr/lib/systemd/system/
[root@master ~]# scp /usr/lib/systemd/system/etcd.service root@192.168.142.132:/usr/lib/systemd/system/

node side

Change the profile received by each node node
node1

[root@node1 etcd]# vim /opt/etcd/cfg/etcd
//[Member]
ETCD_NAME="etcd02"                      //Node name
ETCD_DATA_DIR="/var/lib/etcd/default.etcd"
ETCD_LISTEN_PEER_URLS="https://192.168.142.136:2380 "/ / node address
ETCD_LISTEN_CLIENT_URLS="https://192.168.142.136:2379 "/ / node address

//[Clustering]
ETCD_INITIAL_ADVERTISE_PEER_URLS="https://192.168.142.136:2380 "/ / node address
ETCD_ADVERTISE_CLIENT_URLS="https://192.168.142.136:2379 "/ / node address

node 2

[root@node2 ~]# vim /opt/etcd/cfg/etcd
//[Member]
ETCD_NAME="etcd03"
ETCD_DATA_DIR="/var/lib/etcd/default.etcd"
ETCD_LISTEN_PEER_URLS="https://192.168.142.132:2380 "/ / node name
ETCD_LISTEN_CLIENT_URLS="https://192.168.142.132:2379 "/ / node name

//[Clustering]
ETCD_INITIAL_ADVERTISE_PEER_URLS="https://192.168.142.132:2380 "/ / node name
ETCD_ADVERTISE_CLIENT_URLS="https://192.168.142.132:2379 "/ / node name

Turn on services for all nodes

//Turn off the firewall at each node
[root@node1 etcd]# systemctl stop firewalld.service
[root@node1 etcd]# setenforce 0
[root@node1 etcd]# systemctl disable firewalld.service

//Start etcd service
[root@node1 etcd]# systemctl start etcd
[root@node1 etcd]# systemctl enable etcd

Cluster health check, view cluster members

//Health check of cluster nodes
[root@master ~]# /opt/etcd/bin/etcdctl --ca-file=/opt/etcd/ssl/ca.pem \
--cert-file=/opt/etcd/ssl/server.pem --key-file=/opt/etcd/ssl/server-key.pem \
--endpoints="https://192.168.142.220:2379,https://192.168.142.136:2379,https://192.168.142.132:2379" \
cluster-health

//View etcd cluster members
[root@master ~]# /opt/etcd/bin/etcdctl --ca-file=/opt/etcd/ssl/ca.pem \
--cert-file=/opt/etcd/ssl/server.pem --key-file=/opt/etcd/ssl/server-key.pem \
--endpoints="https://192.168.142.220:2379,https://192.168.142.136:2379,https://192.168.142.132:2379" member list

etcd cluster is built successfully!!