1 安装etcd和flannel

Posted 2022-04-24

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一 docker和etcd安装以及证书配置

1 环境准备

系统 centos7.3
master 192.168.18.103 （所按照的软件：etcd,kube-apiserver,kube-controller-manager,kube-scheduler）
node1 192.168.18.104 (所按照的软件：etcd,docker,kublet,kube-proxy,flannel)
node2 192.168.18.105 (所按照的软件：etcd,docker,kublet,kube-proxy,flannel)
注意，这里我为了节省机器etcd这个我安装到了node节点上面，正常的话应该找单独的机器安装，三台）

2 安装docker（两个node节点上安装）

yum install -y yum-utils device-mapper-persistent-data lvm2

yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo

yum install docker-ce -y
# 设置docker加速器
curl -sSL https://get.daocloud.io/daotools/set_mirror.sh | sh -s
http://bc437cce.m.daocloud.io
systemctl start docker
systemctl enable docker
docker version #查看版本

3 自签etcd证书

1 安装证书生成工具cfssl

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

2 生成证书过程，注意在那个目录下面运行命令证书就会产生在那个目录下面,我这里放到了/home/yx/ssl下面

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": [
        "192.168.18.103",  
    "192.168.18.104",
    "192.168.18.105"
    ],
    "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

4 安装etcd（三台都需要安装）

1 建立目录，

mkdir -p /home/yx/ssl,bin,cfg

2 下载etcd，解压，并移动到指定目录

下载地址 https://github.com/etcd-io/etcd/releases，我这里安装的是etcd-v3.2.12-linux-amd64.tar.gz
移动
mv etcd-v3.2.12-linux-amd64/etcd /home/yx/etcd/bin/
mv etcd-v3.2.12-linux-amd64/etcdctl /home/yx/etcd/bin/

3 配置文件


# 里面的ip根据自己的情况来定       
[[email protected] ~]# cat /home/yx/etcd/cfg/etcd
#[Member]
ETCD_NAME="etcd01"  
ETCD_DATA_DIR="/home/yx/etcd/default.etcd"
ETCD_LISTEN_PEER_URLS="https://192.168.18.103:2380"
ETCD_LISTEN_CLIENT_URLS="https://192.168.18.103:2379"

#[Clustering]
ETCD_INITIAL_ADVERTISE_PEER_URLS="https://192.168.18.103:2380"
ETCD_ADVERTISE_CLIENT_URLS="https://192.168.18.103:2379"
ETCD_INITIAL_CLUSTER="etcd01=https://192.168.18.103:2380,etcd02=https://192.168.18.104:2380,etcd03=https://192.168.18.105:2380"
ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster"
ETCD_INITIAL_CLUSTER_STATE="new

4 拷贝证书

#把生成的证书拷贝到etcd的ssl目录下面
cp -r /home/yx/ssl/*.pem /home/yx/etcd/ssl

5 配置etcd启动脚本

cat /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=/home/yx/etcd/cfg/etcd #这个是你配置文件的路径
ExecStart=/home/yx/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 --initial-cluster-state=new --cert-file=/home/yx/etcd/ssl/server.pem --key-file=/home/yx/etcd/ssl/server-key.pem --peer-cert-file=/home/yx/etcd/ssl/server.pem --peer-key-file=/home/yx/etcd/ssl/server-key.pem --trusted-ca-file=/home/yx/etcd/ssl/ca.pem --peer-trusted-ca-file=/home/yx/etcd/ssl/ca.pem
Restart=on-failure
LimitNOFILE=65536

6 启动并拷贝启动脚本和配置文件到其余两台机器上面

systemctl start etcd
systemctl enable etcd
ps -ef | grep etcd
注意：如果只是其中一台启动，日志里面可能会提示信息，需要三台全部启动完毕即可。
# 如果启动报错，可以查看/var/log/message/ 或者journalctl -u etcd 查看错误信息

scp -r /usr/lib/systemd/system/etcd.service [email protected]:/usr/lib/systemd/system/
scp -r /home/yx/etcd/ [email protected]:/home/yx/ #这个里面包含了配置文件，证书等

7 检查etcd集群状态：

检测之前要进去到证书的目录下面，cd /home/yx/etcd/ssl

/home/yx/etcd/bin/etcdctl --ca-file=ca.pem --cert-file=server.pem --key-file=server-key-endpoints="https://192.168.18.103:2379,https://192.168.18.104:2379,https://192.168.18.1
member 257fc3f3cf354f5 is healthy: got healthy result from https://192.168.18.103:2379
member 49ea5453c8e9f751 is healthy: got healthy result from https://192.168.18.105:2379
member 59f641f0f8e3fd7a is healthy: got healthy result from https://192.168.18.104:2379
cluster is healthy
如果输出上面信息，就说明集群部署成功

二部署flannel集群网络

1 在master上面操作，写入分配的子网段到etcd，供flanneld使用

[[email protected] ssl]$ /home/yx/etcd/bin/etcdctl --ca-file=ca.pem --cert-file=server.pem --key-file=server-key.pem --endpoints="https://192.168.18.103:2379,https://192.168.18.104:2379,https://192.168.18.105:2379" set /coreos.com/network/config ‘ "Network": "172.17.0.0/16", "Backend": "Type": "vxlan"‘
#产生下面信息为正常
 "Network": "172.17.0.0/16", "Backend": "Type": "vxlan"

2 创建目录（在所有node节点上面操作）


mkdir -p /home/yx/flannel/cfg,ssl,bin

3 下载并解压移动

wget https://github.com/coreos/flannel/releases/download/v0.10.0/flannel-v0.10.0-linux-amd64.tar.gz
tar zxvf flannel-v0.9.1-linux-amd64.tar.gz
 mv flanneld mk-docker-opts.sh /home/yx/flannel/bin

4 配置flannel配置文件

cat /home/yx/flannel/cfg/flanneld
FLANNEL_OPTIONS="--etcd-endpoints=https://192.168.18.103:2379,https://192.168.18.104:2379,https://192.168.18.105:2379 -etcd-cafile=/home/yx/etcd/ssl/ca.pem -etcd-certfile=/home/yx/etcd/ssl/server.pem -etcd-keyfile=/home/yx/etcd/ssl/server-key.pem"

5 配置systemd管理Flannel用户启动flannel

# 注意里面的目录一定要写正确，不然会各种报错
[[email protected] ~]$ cat /usr/lib/systemd/system/flanneld.service
[Unit]
Description=Flanneld overlay address etcd agent
After=network-online.target network.target
Before=docker.service

[Service]
Type=notify
EnvironmentFile=/home/yx/flannel/cfg/flanneld  
ExecStart=/home/yx/flannel/bin/flanneld --ip-masq $FLANNEL_OPTIONS
ExecStartPost=/home/yx/flannel/bin/mk-docker-opts.sh -k DOCKER_NETWORK_OPTIONS -d /run/flannel/subnet.env
Restart=on-failure

[Install]
WantedBy=multi-user.target

6 配置Docker启动指定子网段：,更改之前先备份一下文件

[[email protected] ~]$ cat /usr/lib/systemd/system/docker.service
[Unit]
Description=Docker Application Container Engine
Documentation=https://docs.docker.com
After=network-online.target firewalld.service
Wants=network-online.target
[Service]
Type=notify
EnvironmentFile=/run/flannel/subnet.env
ExecStart=/usr/bin/dockerd $DOCKER_NETWORK_OPTIONS
ExecReload=/bin/kill -s HUP $MAINPID
LimitNOFILE=infinity
LimitNPROC=infinity
LimitCORE=infinity
TimeoutStartSec=0
Delegate=yes
KillMode=process
Restart=on-failure
StartLimitBurst=3
StartLimitInterval=60s
[Install]
WantedBy=multi-user.target

7 启动flannel和docker

systemctl daemon-reload
 systemctl start flanneld
 systemctl enable flanneld
 systemctl restart docker

8 验证

[[email protected] ~]$ ps -ef |grep docker
root 977 1 0 17:19 ? 00:00:02 /usr/bin/dockerd --bip=172.17.62.1/24 --ip-masq=false --mtu=1450
root 984 977 0 17:19 ? 00:00:03 containerd --config /var/run/docker/containerd/containerd.toml --log-level info
yx 11000 30416 0 17:54 pts/0 00:00:00 grep --color=auto docker

再用ip add验证一下,确保docker0与flannel.1在同一网段。

如下图所示

技术图片
然后在当前节点去ping另一个节点的docker0的ip，是通的

技术图片

9 没问题的话拷贝文件和脚本到另一个node节点上面

scp -r flannel/ [email protected]:/home/yx/
scp -r /usr/lib/systemd/system/flanneld.service [email protected]:/usr/lib/systemd/system/
scp -r /usr/lib/systemd/system/docker.service [email protected]:/usr/lib/systemd/system/

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