K8S environment deployment

Cluster environment

node	operating system	IP address
master	centos 7.6	192.168.176.181
node1	centos 7.6	192.168.176.182
node2	centos 7.6	192.168.176.183

systemctl stop firewalld
setenforce 0

Download the certificate maker

curl -L https://pkg.cfssl.org/R1.2/cfssl_linux-amd64 -o /usr/local/bin/cfssl
curl -L https://pkg.cfssl.org/R1.2/cfssljson_linux-amd64 -o /usr/local/bin/cfssljson
curl -L https://pkg.cfssl.org/R1.2/cfssl-certinfo_linux-amd64 -o /usr/local/bin/cfssl-certinfo
chmod +x /usr/local/bin/cfssl /usr/local/bin/cfssljson /usr/local/bin/cfssl-certinfo

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cfssl certificate generation tool cfssljson generates a certificate
by passing in a json file
cfssl-certinfo View certificate information

Make a certificate

Define CA certificate

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

Implement certificate signing

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

Production certificate

Generate ca-key.pem ca.pem
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Specify communication verification between the three nodes of etcd

cat > server-csr.json <<EOF
{
    "CN": "etcd",
    "hosts": [
    "192.168.176.181",
    "192.168.176.182",
    "192.168.176.183"
    ],
    "key": {
        "algo": "rsa",
        "size": 2048
    },
    "names": [
        {
            "C": "CN",
            "L": "BeiJing",
            "ST": "BeiJing"
        }
    ]
}
EOF

Generate ETCD certificate

server-key.pem server.pem

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

ETCD binary package address
https://github.com/etcd-io/etcd/releases

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[root@master k8s]# pwd
/root/k8s
[root@master k8s]# tar xf etcd-v3.3.10-linux-amd64.tar.gz
[root@master k8s]# mkdir /opt/etcd/{cfg,bin,ssl} -p
[root@master etcd-v3.3.10-linux-amd64]# cd etcd-v3.3.10-linux-amd64/
[root@master etcd-v3.3.10-linux-amd64]# mv etcd etcdctl /opt/etcd/bin/

Certificate copy

[root@master etcd-cert]# pwd
/root/k8s/etcd-cert
[root@master etcd-cert]# 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
[root@master etcd-cert]# cp *.pem /opt/ssl/

[root@master k8s]# cat etcd.sh

#!/bin/bash

ETCD_NAME=$1
ETCD_IP=$2
ETCD_CLUSTER=$3

WORK_DIR=/opt/etcd

cat <<EOF >$WORK_DIR/cfg/etcd
#[Member]
ETCD_NAME="${ETCD_NAME}"
ETCD_DATA_DIR="/var/lib/etcd/default.etcd"
ETCD_LISTEN_PEER_URLS="https://${ETCD_IP}:2380"
ETCD_LISTEN_CLIENT_URLS="https://${ETCD_IP}:2379"

#[Clustering]
ETCD_INITIAL_ADVERTISE_PEER_URLS="https://${ETCD_IP}:2380"
ETCD_ADVERTISE_CLIENT_URLS="https://${ETCD_IP}:2379"
ETCD_INITIAL_CLUSTER="etcd01=https://${ETCD_IP}:2380,${ETCD_CLUSTER}"
ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster"
ETCD_INITIAL_CLUSTER_STATE="new"
EOF

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=${WORK_DIR}/cfg/etcd
ExecStart=${WORK_DIR}/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=${WORK_DIR}/ssl/server.pem \
--key-file=${WORK_DIR}/ssl/server-key.pem \
--peer-cert-file=${WORK_DIR}/ssl/server.pem \
--peer-key-file=${WORK_DIR}/ssl/server-key.pem \
--trusted-ca-file=${WORK_DIR}/ssl/ca.pem \
--peer-trusted-ca-file=${WORK_DIR}/ssl/ca.pem
Restart=on-failure
LimitNOFILE=65536

[Install]
WantedBy=multi-user.target
EOF

systemctl daemon-reload
systemctl enable etcd
systemctl restart etcd

[root@master k8s]# bash etcd.sh etcd01 192.168.176.181 etcd02=https://192.168.176.182:2380,etcd03=https://192.168.176.183:2380

Enter the stuck state and wait for other nodes to join

Copy the certificate to other nodes

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[root@master ~]# scp -r /opt/etcd/ [email protected]:/opt/
[root@master ~]# scp -r /opt/etcd/ [email protected]:/opt/

[root@master ~]# scp /usr/lib/systemd/system/etcd.service [email protected]:/usr/lib/systemd/system/
[root@master ~]# scp /usr/lib/systemd/system/etcd.service [email protected]:/usr/lib/systemd/system/

node1 node

[root@node1 ~]# vi /opt/etcd/cfg/etcd
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[root@node1 ~]# systemctl start etcd

node2 node

[root@node2 ~]# vi /opt/etcd/cfg/etcd
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[root@node2 ~]# systemctl start etcd

Check cluster status

[root@master k8s]# cd etcd-cert/
[root@master etcd-cert]# 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
[root@master etcd-cert]# /opt/etcd/bin/etcdctl --ca-file=ca.pem --cert-file=server.pem --key-file=server-key.pem --endpoints="https://192.168.176.181:2379,https://192.168.176.182:2379,https://192.168.176.183:2379" cluster-health
member 1bac462354865617 is healthy: got healthy result from https://192.168.176.183:2379
member 942466aa4bcbcb14 is healthy: got healthy result from https://192.168.176.182:2379
member c5fc7a849b104451 is healthy: got healthy result from https://192.168.176.181:2379