k8s集群部署之环境介绍与etcd数据库集群部署

角色	IP	组件	配置
master-1	192.168.10.11	kube-apiserver kube-controller-manager kube-scheduler etcd	2c 2g
master-2	192.168.10.12	kube-apiserver kube-controller-manager kube-scheduler etcd	2c 2g
node-1	192.168.10.13	kubelet kube-proxy docker flannel etcd	2c 2g
node-2	192.168.10.14	kubelet kube-proxy docker flannel	2c 2g
nginx负载主	192.168.10.15 192.168.10.20（vip）	nginx	2c 2g
nginx负载备	192.168.10.16	nginx	2c 2g
Registry	192.168.10.17	harbor	2c 2g

多master集群架构图

环境准备，关闭SELinux

[root@mast-1 ~]# vi /etc/selinux/config 

# This file controls the state of SELinux on the system.

# SELINUX= can take one of these three values:

#     enforcing - SELinux security policy is enforced.

#     permissive - SELinux prints warnings instead of enforcing.

#     disabled - No SELinux policy is loaded.

SELINUX=disabled    永久关闭

# SELINUXTYPE= can take one of three two values:

#     targeted - Targeted processes are protected,

#     minimum - Modification of targeted policy. Only selected processes are protected.

#     mls - Multi Level Security protection.

SELINUXTYPE=targeted

[root@mast-1 ~]# setenforce 0

[root@mast-1 ~]# systemctl stop firewalld.service

[root@mast-1 ~]# systemctl disable firewalld.service

生成自签证书

[root@mast-1 ~]# mkdir k8s/{k8s-cert,etcd-cert} -p

[root@mast-1 ~]# cd k8s/

[root@mast-1 k8s]# ls

etcd-cert  k8s-cert

[root@mast-1 k8s]# cd etcd-cert/

[root@mast-1 etcd-cert]# cat etcd-cert.sh

cat > ca-config.json <<EOF

{

  "signing": {

    "default": {

      "expiry": "87600h"

    },

    "profiles": {

      "www": {

         "expiry": "87600h",

         "usages": [

            "signing",

            "key encipherment",

            "server auth",

            "client auth"

        ]

      }

    }

  }

}

EOF

cat > ca-csr.json <<EOF

{

    "CN": "etcd CA",

    "key": {

        "algo": "rsa",

        "size": 2048

    },

    "names": [

        {

            "C": "CN",

            "L": "Beijing",

            "ST": "Beijing"

        }

    ]

}

EOF

cfssl gencert -initca ca-csr.json | cfssljson -bare ca -

#-----------------------

cat > server-csr.json <<EOF

{

    "CN": "etcd",

    "hosts": [

    "10.206.240.188",

    "10.206.240.189",

    "10.206.240.111"

    ],

    "key": {

        "algo": "rsa",

        "size": 2048

    },

    "names": [

        {

            "C": "CN",

            "L": "BeiJing",

            "ST": "BeiJing"

        }

    ]

}

EOF

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

 时间同步

[root@mast-1 etcd-cert]# ntpdate time.windows.com

19 Apr 18:08:01 ntpdate[18507]: adjust time server 52.175.49.4 offset -0.038617 sec

安装工具

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

生成证书

[root@mast-1 etcd-cert]# bash etcd-cert.sh

2019/04/19 18:12:51 [INFO] generating a new CA key and certificate from CSR

2019/04/19 18:12:51 [INFO] generate received request

2019/04/19 18:12:51 [INFO] received CSR

2019/04/19 18:12:51 [INFO] generating key: rsa-2048

2019/04/19 18:12:52 [INFO] encoded CSR

2019/04/19 18:12:52 [INFO] signed certificate with serial number 68673429772362340986397269642150956332201052001

2019/04/19 18:12:52 [INFO] generate received request

2019/04/19 18:12:52 [INFO] received CSR

2019/04/19 18:12:52 [INFO] generating key: rsa-2048

2019/04/19 18:12:53 [INFO] encoded CSR

2019/04/19 18:12:53 [INFO] signed certificate with serial number 481813885977621272201720696275880807248023743489

2019/04/19 18:12:53 [WARNING] This certificate lacks a "hosts" field. This makes it unsuitable for

websites. For more information see the Baseline Requirements for the Issuance and Management

of Publicly-Trusted Certificates, v.1.1.6, from the CA/Browser Forum (https://cabforum.org);

specifically, section 10.2.3 ("Information Requirements").

[root@mast-1 etcd-cert]# ls

ca-config.json  ca.csr  ca-csr.json  ca-key.pem  ca.pem  etcd-cert.sh  server.csr  server-csr.json  server-key.pem  server.pem

生成CA证书

[root@mast-1 etcd-cert]# cat > ca-config.json <<EOF

> {

>   "signing": {

>     "default": {

>       "expiry": "87600h"

>     },

>     "profiles": {

>       "www": {

>          "expiry": "87600h",

>          "usages": [

>             "signing",

>             "key encipherment",

>             "server auth",

>             "client auth"

>         ]

>       }

>     }

>   }

> }

> EOF

[root@mast-1 etcd-cert]#

[root@mast-1 etcd-cert]# cat > ca-csr.json <<EOF

> {

>     "CN": "etcd CA",

>     "key": {

>         "algo": "rsa",

>         "size": 2048

>     },

>     "names": [

>         {

>             "C": "CN",

>             "L": "Beijing",

>             "ST": "Beijing"

>         }

>     ]

> }

> EOF

[root@mast-1 etcd-cert]#

[root@mast-1 etcd-cert]# cfssl gencert -initca ca-csr.json | cfssljson -bare ca -

2019/04/19 18:21:15 [INFO] generating a new CA key and certificate from CSR

2019/04/19 18:21:15 [INFO] generate received request

2019/04/19 18:21:15 [INFO] received CSR

2019/04/19 18:21:15 [INFO] generating key: rsa-2048

2019/04/19 18:21:15 [INFO] encoded CSR

2019/04/19 18:21:15 [INFO] signed certificate with serial number 601159451155869323088996388702263627368633639404

[root@mast-1 etcd-cert]# ls

ca-config.json  ca.csr  ca-csr.json  ca-key.pem  ca.pem

生成etcd证书

[root@mast-1 etcd-cert]# cat > server-csr.json <<EOF

> {

>     "CN": "etcd",

>     "hosts": [

>     "192.168.10.11",

>     "192.168.10.12",

>     "192.168.10.13"

>     ],

>     "key": {

>         "algo": "rsa",

>         "size": 2048

>     },

>     "names": [

>         {

>             "C": "CN",

>             "L": "BeiJing",

>             "ST": "BeiJing"

>         }

>     ]

> }

> EOF

[root@mast-1 etcd-cert]#

[root@mast-1 etcd-cert]# cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=www server-csr.json | cfssljson -bare server

2019/04/19 18:26:38 [INFO] generate received request

2019/04/19 18:26:38 [INFO] received CSR

2019/04/19 18:26:38 [INFO] generating key: rsa-2048

2019/04/19 18:26:38 [INFO] encoded CSR

2019/04/19 18:26:38 [INFO] signed certificate with serial number 20600129498404647940919904437550435044516988458

2019/04/19 18:26:38 [WARNING] This certificate lacks a "hosts" field. This makes it unsuitable for

websites. For more information see the Baseline Requirements for the Issuance and Management

of Publicly-Trusted Certificates, v.1.1.6, from the CA/Browser Forum (https://cabforum.org);

specifically, section 10.2.3 ("Information Requirements").

　ETCD数据库集群部署　

[root@mast-1 ~]# mkdir APP

[root@mast-1 ~]# mv etcd-v3.3.10-linux-amd64.tar.gz APP/

[root@mast-1 ~]# cd APP/

[root@mast-1 APP]# ls

etcd-v3.3.10-linux-amd64.tar.gz

[root@mast-1 APP]# ls

etcd-v3.3.10-linux-amd64.tar.gz

[root@mast-1 APP]# tar xf etcd-v3.3.10-linux-amd64.tar.gz

[root@mast-1 APP]# ls

etcd-v3.3.10-linux-amd64  etcd-v3.3.10-linux-amd64.tar.gz

[root@mast-1 APP]# cd etcd-v3.3.10-linux-amd64/

[root@mast-1 etcd-v3.3.10-linux-amd64]# ls

Documentation  etcd  etcdctl  README-etcdctl.md  README.md  READMEv2-etcdctl.md

[root@mast-1 etcd-v3.3.10-linux-amd64]# mkdir -pv /opt/etcd/{cfg,bin,ssl}

mkdir: 已创建目录 "/opt/etcd"

mkdir: 已创建目录 "/opt/etcd/cfg"

mkdir: 已创建目录 "/opt/etcd/bin"

mkdir: 已创建目录 "/opt/etcd/ssl"

[root@mast-1 etcd-v3.3.10-linux-amd64]# mv etcd etcdctl /opt/etcd/bin/

[root@mast-1 etcd-v3.3.10-linux-amd64]# cd ~/k8s/

[root@mast-1 k8s]# ls

etcd-cert  etcd.sh  k8s-cert

生成etcd配置文件脚本

[root@mast-1 k8s]# cat etcd.sh

#!/bin/bash

# example: ./etcd.sh etcd01 192.168.1.10 etcd02=https://192.168.1.11:2380,etcd03=https://192.168.1.12:2380

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

启动有问题

[root@mast-1 k8s]# ./etcd.sh etcd01 192.168.10.11 etcd02=https://192.168.10.12:2380,etcd03=https://192.168.10.13:2380

Job for etcd.service failed because the control process exited with error code. See "systemctl status etcd.service" and "journalctl -xe" for details.

查看配置文件

[root@mast-1 k8s]# cat /opt/etcd/cfg/etcd

#[Member]

ETCD_NAME="etcd01"

ETCD_DATA_DIR="/var/lib/etcd/default.etcd"

ETCD_LISTEN_PEER_URLS="https://192.168.10.11:2380"

ETCD_LISTEN_CLIENT_URLS="https://192.168.10.11:2379"

#[Clustering]

ETCD_INITIAL_ADVERTISE_PEER_URLS="https://192.168.10.11:2380"

ETCD_ADVERTISE_CLIENT_URLS="https://192.168.10.11:2379"

ETCD_INITIAL_CLUSTER="etcd01=https://192.168.10.11:2380,etcd02=https://192.168.10.12:2380,etcd03=https://192.168.10.13:2380"

ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster"

ETCD_INITIAL_CLUSTER_STATE="new"

复制证书

[root@mast-1 k8s]# cp etcd-cert/{ca,server-key,server}.pem /opt/etcd/ssl/

[root@mast-1 k8s]# systemctl start etcd

[root@mast-1 ~]# tail -10 /var/log/messages

Apr 19 18:59:01 localhost etcd: 6571fb7574e87dba [logterm: 1, index: 3] sent MsgVote request to d1fbb74bc6a61e5c at term 55

Apr 19 18:59:02 localhost etcd: 6571fb7574e87dba is starting a new election at term 55

Apr 19 18:59:02 localhost etcd: 6571fb7574e87dba became candidate at term 56

Apr 19 18:59:02 localhost etcd: 6571fb7574e87dba received MsgVoteResp from 6571fb7574e87dba at term 56

Apr 19 18:59:02 localhost etcd: 6571fb7574e87dba [logterm: 1, index: 3] sent MsgVote request to d1fbb74bc6a61e5c at term 56

Apr 19 18:59:02 localhost etcd: 6571fb7574e87dba [logterm: 1, index: 3] sent MsgVote request to 9b449b0ff1d4c375 at term 56

Apr 19 18:59:03 localhost etcd: health check for peer 9b449b0ff1d4c375 could not connect: dial tcp 192.168.10.12:2380: connect: connection refused (prober "ROUND_TRIPPER_RAFT_MESSAGE")

Apr 19 18:59:03 localhost etcd: health check for peer d1fbb74bc6a61e5c could not connect: dial tcp 192.168.10.13:2380: connect: connection refused (prober "ROUND_TRIPPER_SNAPSHOT")

Apr 19 18:59:03 localhost etcd: health check for peer 9b449b0ff1d4c375 could not connect: dial tcp 192.168.10.12:2380: connect: connection refused (prober "ROUND_TRIPPER_SNAPSHOT")

Apr 19 18:59:03 localhost etcd: health check for peer d1fbb74bc6a61e5c could not connect: dial tcp 192.168.10.13:2380: connect: connection refused (prober "ROUND_TRIPPER_RAFT_MESSAGE")

将etcd拷贝其他节点

[root@mast-1 k8s]# scp -r /opt/etcd 192.168.10.12:/opt/

The authenticity of host '192.168.10.12 (192.168.10.12)' can't be established.

ECDSA key fingerprint is SHA256:K3leIm01q6LfP3t9FEMEtJq0njLut9ZzCGxcHUEWSDk.

ECDSA key fingerprint is MD5:db:5c:1e:fd:4c:e4:fc:b2:bd:63:b9:81:92:5e:fd:f5.

Are you sure you want to continue connecting (yes/no)? yes

Warning: Permanently added '192.168.10.12' (ECDSA) to the list of known hosts.

root@192.168.10.12's password:

etcd                                                                                                                                                         100%  509    54.0KB/s   00:00

etcd                                                                                                                                                         100%   18MB  19.5MB/s   00:00

etcdctl                                                                                                                                                      100%   15MB   8.9MB/s   00:01

ca.pem                                                                                                                                                       100% 1265    43.5KB/s   00:00

server-key.pem                                                                                                                                               100% 1675   242.4KB/s   00:00

server.pem                                                                                                                                                   100% 1338   304.7KB/s   00:00

[root@mast-1 k8s]# scp -r /opt/etcd 192.168.10.13:/opt/

The authenticity of host '192.168.10.13 (192.168.10.13)' can't be established.

ECDSA key fingerprint is SHA256:UB3BsWnL8Kd/kNjYziPzdMZFo8ucoJn49Ar7TkFaOUI.

ECDSA key fingerprint is MD5:31:d0:3c:eb:60:bd:0a:55:df:72:da:d3:4d:67:16:e6.

Are you sure you want to continue connecting (yes/no)? yes

Warning: Permanently added '192.168.10.13' (ECDSA) to the list of known hosts.

root@192.168.10.13's password:

etcd                                                                                                                                                         100%  509   197.1KB/s   00:00

etcd                                                                                                                                                         100%   18MB   6.8MB/s   00:02

etcdctl                                                                                                                                                      100%   15MB  15.1MB/s   00:01

ca.pem                                                                                                                                                       100% 1265    12.2KB/s   00:00

server-key.pem                                                                                                                                               100% 1675    27.0KB/s   00:00

server.pem

[root@mast-1 k8s]# scp /usr/lib/systemd/system/etcd.service 192.168.10.12:/usr/lib/systemd/system

root@192.168.10.12's password:

etcd.service                                                                                                                                                 100%  923    28.2KB/s   00:00

[root@mast-1 k8s]# scp /usr/lib/systemd/system/etcd.service 192.168.10.13:/usr/lib/systemd/system

root@192.168.10.13's password:

etcd.service

修改etcd2 的配置文件节点名字与IP地址

 [root@mast-2 cfg]# vi etcd 

#[Member]

ETCD_NAME="etcd02"

ETCD_DATA_DIR="/var/lib/etcd/default.etcd"

ETCD_LISTEN_PEER_URLS="https://192.168.10.12:2380"

ETCD_LISTEN_CLIENT_URLS="https://192.168.10.12:2379"

#[Clustering]

ETCD_INITIAL_ADVERTISE_PEER_URLS="https://192.168.10.12:2380"

ETCD_ADVERTISE_CLIENT_URLS="https://192.168.10.12:2379"

ETCD_INITIAL_CLUSTER="etcd01=https://192.168.10.11:2380,etcd02=https://192.168.10.12:2380,etcd03=https://192.168.10.13:2380"

ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster"

ETCD_INITIAL_CLUSTER_STATE="new"

修改etcd3 的配置文件节点名字与IP地址

[root@node-1 cfg]# vi etcd 

#[Member]

ETCD_NAME="etcd03"

ETCD_DATA_DIR="/var/lib/etcd/default.etcd"

ETCD_LISTEN_PEER_URLS="https://192.168.10.13:2380"

ETCD_LISTEN_CLIENT_URLS="https://192.168.10.13:2379"

#[Clustering]

ETCD_INITIAL_ADVERTISE_PEER_URLS="https://192.168.10.13:2380"

ETCD_ADVERTISE_CLIENT_URLS="https://192.168.10.13:2379"

ETCD_INITIAL_CLUSTER="etcd01=https://192.168.10.11:2380,etcd02=https://192.168.10.12:2380,etcd03=https://192.168.10.13:2380"

ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster"

ETCD_INITIAL_CLUSTER_STATE="new"

启动节点1

[root@mast-1 k8s]# systemctl start etcd

启动节点2

[root@mast-2 cfg]# systemctl daemon-reload

[root@mast-2 cfg]# systemctl start etcd

[root@mast-2 cfg]#

启动节点3

[root@node-1 cfg]# systemctl daemon-reload

[root@node-1 cfg]# systemctl start etcd

[root@node-1 cfg]# vi etcd 

[root@mast-1 ~]# tail -10 /var/log/messages

Apr 19 19:16:44 localhost etcd: server is likely overloaded

Apr 19 19:17:02 localhost etcd: failed to send out heartbeat on time (exceeded the 100ms timeout for 1.126288546s)

Apr 19 19:17:02 localhost etcd: server is likely overloaded

Apr 19 19:17:02 localhost etcd: failed to send out heartbeat on time (exceeded the 100ms timeout for 1.12637708s)

Apr 19 19:17:02 localhost etcd: server is likely overloaded

Apr 19 19:17:02 localhost etcd: 6571fb7574e87dba [term: 634] received a MsgAppResp message with higher term from d1fbb74bc6a61e5c [term: 635]

Apr 19 19:17:02 localhost etcd: 6571fb7574e87dba became follower at term 635

Apr 19 19:17:02 localhost etcd: raft.node: 6571fb7574e87dba lost leader 6571fb7574e87dba at term 635

Apr 19 19:17:02 localhost etcd: 6571fb7574e87dba [logterm: 634, index: 9, vote: 0] cast MsgVote for 9b449b0ff1d4c375 [logterm: 634, index: 9] at term 635

Apr 19 19:17:02 localhost etcd: raft.node: 6571fb7574e87dba elected leader 9b449b0ff1d4c375 at term 635

检查集群监控状态，数据端口

[root@mast-1 ~]# /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://192.168.10.11:2379,http

s://192.168.10.12:2379,https://192.168.10.13:2379" cluster-healthmember 6571fb7574e87dba is healthy: got healthy result from https://192.168.10.11:2379

member 9b449b0ff1d4c375 is healthy: got healthy result from https://192.168.10.12:2379

member d1fbb74bc6a61e5c is healthy: got healthy result from https://192.168.10.13:2379

cluster is healthy

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