K8S笔记1-etcd/docker/flannel配置
先导知识:负载均衡工作原理docker基本管理了解集群、分布式概念了解域名解析原理了解网络协议
参考自:http://blog.51cto.com/lizhenliang/2325770
先导知识:
负载均衡工作原理
docker基本管理
了解集群、分布式概念
了解域名解析原理
了解网络协议
master01 10.0.3.171
node1 10.0.3.104
node2 10.0.3.150
#关闭selinux,安全机制,文件的细粒度控制
vim /etc/selinux/config
········
SELINUX=disabled
··········
---------or--------
setenforce 0
关闭防火墙
systemctl stop firewalld
systemctl disable firewalld
以上部分在每一台机子上都要关闭
操作
一、部署etcd集群
mkdir k8s
ls
cd k8s
#下载cfssl工具
vi cfssl.sh
-----------------
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
-----------------------
bash cfssl.sh
ls /usr/local/bin/
cfssl # 查看工具
生成证书
#创建一个证书的文件夹etcd-cert,存放etcd的证书
mkdir etcd-cert
cd etcd-cert
cat > ca-config.json <<EOF
{
"signing": {
"default": {
"expiry": "87600h" #十年期限
},
"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": [
##写自己的IP地址
#"192.168.31.63",
#"192.168.31.65",
#"192.168.31.66"
"10.0.3.171",
"10.0.3.104",
"10.0.3.150",
],
"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
ls *pem
生成证书:ca-key.pem; ca.pem;server-key.pem;server.pem
部署etcd
mkdir /opt/etcd/{bin,cfg,ssl} -p
cp ca*pem server*pem /opt/etcd/ssl
#/k8s目录下,下载etcd二进制包
wget https://github.com/etcd-io/etcd/releases/download/v3.3.10/etcd-v3.3.10-linux-amd64.tar.gz
#也可以在本地下载,通过cmd拷贝过去
scp etcd-v3.3.10-linux-amd64.tar.gz root@10.0.3.171:/root/k8s/
部署etcd
tar zxvf etcd-v3.3.10-linux-amd64.tar.gz
mv etcd-v3.3.10-linux-amd64/{etcd,etcdctl} /opt/etcd/bin/
创建etcd配置文件,运行集成文件etcd.sh.
#vi etcd.sh
#!/bin/bash
# example: ./etcd.sh etcd01 10.0.3.171 etcd02=https://10.0.3.104:2380,etcd03=https://10.0.3.150:2380
ETCD_NAME=$1
ETCD_IP=$2
ETCD_CLUSTER=$3
WORK_DIR=/opt/etcd
cat <<EOF >$WORK_DIR/cfg/etcd
#----------创建etcd配置文件-------------
#[Member]
#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_NAME="${ETCD_NAME}"
ETCD_DATA_DIR="/var/lib/etcd/default.etcd"
ETCD_LISTEN_PEER_URLS="https://${ETCD_IP}:2380"
ETCD_LISTEN_CLIENT_URLS="https://${ETCD_IP}:2379"
#[Clustering]
#ETCD_INITIAL_CLUSTER:集群节点地址
#ETCD_INITIAL_CLUSTER_TOKEN:集群token
#ETCD_INITIAL_CLUSTER_STATE:加入集群的当前状态,new是新集群,existing表示加入已有集群
ETCD_INITIAL_ADVERTISE_PEER_URLS="https://${ETCD_IP}:2380"
ETCD_ADVERTISE_CLIENT_URLS="https://${ETCD_IP}:2379"
ETCD_INITIAL_CLUSTER="${ETCD_NAME}=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
#---------systemd管理etcd----------
[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
执行
chmod +x etcd.sh
各节点创建相关目录
mkdir k8s
mkdir /opt/etcd/{bin,cfg,ssl} -p
传送相关配置文件到node中
scp etcd.sh root@10.0.3.104:/root/k8s/
scp -r /opt/etcd/bin/* root@10.0.3.104:/opt/etcd/bin/
scp -r /opt/etcd/ssl root@10.0.3.104:/opt/etcd
cd k8s
# 先在node上跑起来
./etcd.sh etcd02 10.0.3.104 etcd01=https://10.0.3.171:2380,etcd03=https://10.0.3.150:2380
./etcd.sh etcd03 10.0.3.150 etcd01=https://10.0.3.171:2380,etcd02=https://10.0.3.104:2380
./etcd.sh etcd01 10.0.3.171 etcd02=https://10.0.3.104:2380,etcd03=https://10.0.3.150:2380
部署完成检查etcd集群状态:
/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://10.0.3.171:2379,https://10.0.3.104:2379,https://10.0.3.150:2379" cluster-health
export ETCDCTL_API=3
systemctl restart etcd
/opt/etcd/bin/etcdctl member list
##也可以直接在/etc/profile中添加export ETCDCTL_API=3来实现
如果有问题第一步先看日志:/var/log/message 或 journalctl -u etcd
二、在node中安装docker
#在node01和node02中分别进行docker的安装
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
# 加速
curl -sSL https://get.daocloud.io/daotools/set_mirror.sh | sh -s http://f1361db2.m.daocloud.io
systemctl start docker
systemctl enable docker
#############
docker run it nginx
docker version
docker info #查看docker详细信息
三、配置flannel
#在master01中写入预定义子网段
cd k8s/etcd-cert
/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://10.0.3.239:2379,https://10.0.3.247:2379,https://10.0.3.248:2379" \
set /coreos.com/network/config '{ "Network": "172.17.0.0/16", "Backend": {"Type": "vxlan"}}'
将生成的证书拷贝到node01、node02中
scp ca*pem server*pem root@10.0.3.104(150):/opt/etcd/ssl/
在node中部署flannel
mkdir -p /opt/kubernetes/{bin,cfg,ssl}
# 在node01的root目录下
wget https://github.com/coreos/flannel/releases/download/v0.10.0/flannel-v0.10.0-linux-amd64.tar.gz
tar zxvf flannel-v0.10.0-linux-amd64.tar.gz
mv flanneld mk-docker-opts.sh /opt/kubernetes/bin
部署生成flannel、flanneld.service、docker.service等文件,配置文件为
# vi flannel.sh
#-----------------内容如下------------
#!/bin/bash
ETCD_ENDPOINTS=${1:-"etcd_endpoints"} 修改此处etcd_endpoints
# 一般直接修改该文件为https://10.0.3.239:2379,https://10.0.3.247:2379,https://10.0.3.248:2379
# 配置flannel
cat <<EOF >/opt/kubernetes/cfg/flanneld
FLANNEL_OPTIONS="--etcd-endpoints=${ETCD_ENDPOINTS} \
-etcd-cafile=/opt/etcd/ssl/ca.pem \
-etcd-certfile=/opt/etcd/ssl/server.pem \
-etcd-keyfile=/opt/etcd/ssl/server-key.pem"
EOF
# systemd管理flannel
cat <<EOF >/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=/opt/kubernetes/cfg/flanneld
ExecStart=/opt/kubernetes/bin/flanneld --ip-masq \$FLANNEL_OPTIONS
ExecStartPost=/opt/kubernetes/bin/mk-docker-opts.sh -k DOCKER_NETWORK_OPTIONS -d /run/flannel/subnet.env
Restart=on-failure
[Install]
WantedBy=multi-user.target
EOF
#配置docker启动指定子网段,这个万万不能忘
cat <<EOF >/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
EOF
# 重启flannel和docker
systemctl daemon-reload
systemctl enable flanneld
systemctl restart flanneld
systemctl restart docker
检查是否生效
ps -ef |grep docker
ip addr
查看docker是否使用了flannel预定义的网络
同时确保docker0和flannel.1在同一网段。测试不同节点互通,在当前节点访问另一个节点的docker0的IP:
查看另一个node的docker0的IP
ping 172.17.36.1
如果能通,则部署flannel成功;不同的话,通过journalctl -u flannel检查下日志。
在另一个node02上,进行复制配置。
scp -r /opt/kubernetes/ root@10.0.3.150:/opt/
-----------
#note:如果150中无相应的文件夹,生成
mkdir -p /opt/kubernetes/{bin,cfg,ssl}
# 其中cfg:token文件;bin:主文件夹,各种组件;ssl:各种证书
-----------
#copy证书
scp -r /opt/etcd/ssl root@10.0.3.150:/opt/etcd
scp /usr/lib/systemd/system/flanneld.service root@10.0.3.150:/usr/lib/systemd/system
#启动flannel
systemctl start flanneld
systemctl enable flanneld
ps -ef |grep flanneld
#有如下显示,则表明flannel启动成功。
修改docker的启动工具
vi /usr/lib/systemd/system/docker.service
# 启动代码改为
EnvironmentFile=/run/flannel/subnet.env
ExecStart=/usr/bin/dockerd $DOCKER_NETWORK_OPTIONS
ExecReload=/bin/kill -s HUP $MAINPID
docker compose的安装 https://docs.docker.com/compose/install/
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