kubernetes部署-ETCD

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1台controller: 　10.167.130.205
2台node:　10.167.130.206,210

IP地址	主机名
10.167.130.205	node
10.167.130.206	node1
10.167.130.210	node2

节点	组件
node	etcd,kube-apiserver,flanneld,docker,kube-scheduler,kube-controller-manager
node1	etcd,kube-proxy,kubelet,flanneld,docker
node2	etcd,kube-proxy,kubelet,flanneld,docker

准备工作基础环境配置

关防火墙

systemctl stop firewalld && systemctl disable firewalld
setenforce 0 #临时生效

vi /etc/selinux/config

SELINUX=disabled

vim /etc/hosts #修改3台主机的host

10.167.130.205  node
10.167.130.206  node01
10.167.130.210  node02

关闭swap

swapoff -a && sysctl -w vm.swappiness=0

vi /etc/fstab

#UUID=7bff6243-324c-4587-b550-55dc34018ebf swap                    swap    defaults        0 0

cat << EOF | tee /etc/sysctl.d/k8s.conf
net.ipv4.ip_forward = 1
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
EOF

应用系统配置

sysctl -p /etc/sysctl.d/k8s.conf

安装软件包以及配置安装源

mkdir  /data/docker

#安装必须的包。yum-utils提供了yum-config-manager实用程序，并且device-mapper-persistent-data和lvm2需要devicemapper存储驱动程序。
yum install -y yum-utils device-mapper-persistent-data lvm2
#使用以下命令设置稳定存储库。 您始终需要稳定的存储库，即使您也想从边缘或测试存储库安装构建。
yum-config-manager --add-repo http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo
yum makecache fast
yum -y install docker-ce
docker version

systemctl enable docker.service    
systemctl start docker.service

mkdir -p /etc/docker

tee /etc/docker/daemon.json <<-'EOF'
{"registry-mirrors":["https://registry.docker-cn.com"],"graph": "/data/docker"}
EOF

systemctl daemon-reload
systemctl restart docker

ETCD配置

node	node1	node2
10.167.130.205	10.167.130.206	10.167.130.210

软件包安装证书生成工具cfssl：

mkdir /data/ssl -p

cd /data/
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

cd /data/ssl/

二进制包下载地址：https://github.com/etcd-io/etcd/releases/tag/v3.3.10
下载 etcd-v3.3.10-linux-amd64.tar.gz

生成etc集群所需要的key

mkdir /data/ssl/etcd
cd /data/ssl/etcd

vim etcd.sh
# etcd
# cat 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

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

# cat server-csr.json
cat > server-csr.json <<EOF
{
    "CN": "etcd",
    "hosts": [
    "192.168.100.100",
    "192.168.100.101",
    "192.168.100.102"
    ],
    "key": {
        "algo": "rsa",
        "size": 2048
    },
    "names": [
        {
            "C": "CN",
            "L": "BeiJing",
            "ST": "BeiJing"
        }
    ]
}
EOF

sh etcd.sh

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

# ls *pem
ca-key.pem  ca.pem  server-key.pem  server.pem

部署etcd

3个节点都操作


mkdir /data/src/
cd /data/src/

mkdir /opt/etcd/{bin,cfg,ssl} -p
tar xf etcd-v3.3.10-linux-amd64.tar.gz
mv etcd-v3.3.10-linux-amd64/{etcd,etcdctl} /opt/etcd/bin/

vim /opt/etcd/cfg/etcd   
# 3台机器 ETCD_NAME 名字不一样  本机IP不一样 
#[Member]
ETCD_NAME="node"
ETCD_DATA_DIR="/var/lib/etcd/default.etcd"
ETCD_LISTEN_PEER_URLS="https://10.167.130.205:2380" #更改为本机地址
ETCD_LISTEN_CLIENT_URLS="https://10.167.130.205:2379" #更改为本机地址

#[Clustering]
ETCD_INITIAL_ADVERTISE_PEER_URLS="https://10.167.130.205:2380" #更改为本机地址
ETCD_ADVERTISE_CLIENT_URLS="https://10.167.130.205:2379" #更改为本机地址
ETCD_INITIAL_CLUSTER="node=https://10.167.130.205:2380,node1=https://10.167.130.206:2380,node2=https://10.167.130.210:2380"
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


vim   /usr/lib/systemd/system/etcd.service   #添加etcd服务文件

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

[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





cp /data/ssl/etcd/ca*pem  /opt/etcd/ssl/   
cp /data/ssl/etcd/server*pem  /opt/etcd/ssl/
#拷贝生成的etcd证书文件到etcd工作目录里



scp  /data/ssl/etcd/ca*pem  root@node01:/opt/etcd/ssl/
scp  /data/ssl/etcd/ca*pem  root@node02:/opt/etcd/ssl/
scp  /data/ssl/etcd/server*pem  root@node01:/opt/etcd/ssl/
scp  /data/ssl/etcd/server*pem  root@node02:/opt/etcd/ssl/
scp /usr/lib/systemd/system/etcd.service root@node1:/usr/lib/systemd/system/etcd.service
scp /usr/lib/systemd/system/etcd.service root@node2:/usr/lib/systemd/system/etcd.service



systemctl daemon-reload
systemctl enable etcd
systemctl start etcd

检查查看集群状态：

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cd /data/ssl/etcd/
/opt/etcd/bin/etcdctl --ca-file=ca.pem --cert-file=server.pem --key-file=server-key.pem --endpoints="https://10.167.130.205:2379,https://10.167.130.206:2379,https://10.167.130.210:2379" cluster-health
member 65f49728d3d54972 is healthy: got healthy result from https://192.168.100.100:2379
member d94ba21c17c75ffb is healthy: got healthy result from https://192.168.100.101:2379
member dc51f874259f7894 is healthy: got healthy result from https://192.168.100.102:2379
cluster is healthy

# 如果有问题第一步先看日志：/var/log/message 或 journalctl -u etcd

此处etcd集群遇到了一个问题 205在线显示正常 206 210 在线就显示不正常这两组一直抢占
最后发现是之前有装过etcd 默认的数据文件default.etcd 已经生成了咱们从新配置的etcd数据文件被命名成了default.etcd1 我们配置文件又指定的default.etcd 所以会有问题

[root@node etcd]# ls
default.etcd default.etcd1
[root@node etcd]# pwd
/var/lib/etcd

kubernetes部署-ETCD(一)

规划

准备工作基础环境配置

安装软件包以及配置安装源

ETCD配置

生成etc集群所需要的key

部署etcd

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