大佬教程收集整理的这篇文章主要介绍了通过RKE 安装kubernetes，大佬教程大佬觉得挺不错的，现在分享给大家，也给大家做个参考。
作者: 张首富 时间: 2019-02-13 个人博客: www.zhangshoufu.com QQ群: 895291458
我们这边需要4台机器,系统全都是centos7.5
10.0.0.99 MKE.kuber.com 10.0.0.100 master.kuber.com 10.0.0.101 node101.kuber.com 10.0.0.102 node102.kuber.com
sudo sed -i ‘s/SELINUX=enforcing/SELINUX=disabled/g‘ /etc/selinux/config # 关闭selinux systemctl stop firewalld.service && systemctl disable firewalld.service # 关闭防火墙 echo ‘LANG="en_US.UTF-8"‘ >> /etc/profile;source /etc/profile #修改系统语言 ln -sf /usr/share/zoneinfo/Asia/Shanghai /etc/localtime # 修改时区（如果需要修改） # 添加hosts文件 # 性能调优 cat >> /etc/sysctl.conf<<EOF net.ipv4.ip_forward=1 net.bridge.bridge-nf-call-iptables=1 net.ipv4.neigh.default.gc_thresh1=4096 net.ipv4.neigh.default.gc_thresh2=6144 net.ipv4.neigh.default.gc_thresh3=8192 EOF sysctl –p
配置相关转发
cat <<EOF > /etc/sysctl.d/k8s.conf net.bridge.bridge-nf-call-ip6tables = 1 net.bridge.bridge-nf-call-iptables = 1 vm.swappiness=0 EOF sysctl --system
cat <<EOF > /etc/yum.repos.d/kubernetes.repo [kubernetes] name=Kubernetes baseurl=https://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64 enabled=1 gpgcheck=1 repo_gpgcheck=1 gpgkey=https://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg https://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg EOF
yum -y install yum-utils yum-config-manager --add-repo http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo yum install -y device-mapper-persistent-data lvm2 sudo yum makecache fast yum -y remove container-selinux.noarch yum install https://download.docker.com/linux/centos/7/x86_64/stable/Packages/docker-ce-selinux-17.03.2.ce-1.el7.centos.noarch.rpm -y yum install docker-ce-17.03.0.ce -y (安装17.03,要不然会出现问题) systemctl start docker && systemctl enable docker
配置docker镜像加速
mkdir -p /etc/docker
tee /etc/docker/daemon.json <<-‘EOF‘
{
"registry-mirrors": ["https://ll9gv5j9.mirror.aliyuncs.com","exec-opts": ["native.cgroupdriver=systemd"]]
}
EOF
配置镜像加速地址
可以配置多条，以数组的形式编写，地址需要添加协议头。编辑/etc/docker/daemon.json加入以下内容
{
"registry-mirrors": ["https://z34wtdhg.mirror.aliyuncs.com","https://$IP:$PROT"]
}
配置私有仓库 (可选)
Docker默认只信任TLS加密的仓库地址(https)，所有非https仓库默认无法登陆也无法拉取镜像。insecure-registries字面意思为不安全的仓库，通过添加这个参数对非https仓库进行授信。可以设置多个insecure-registries地址，以数组形式书写，地址不能添加协议头(http)。编辑/etc/docker/daemon.json加入以下内容:
{
"insecure-registries":["harbor.httpshop.com","bh-harbor.suixingpay.com"]
}
配置Docker存储驱动（可选）
存储驱动有很多种，例如：overlay、overlay2、devicemapper等，前两者是OverlayFS类型的，是一个新一代的联合文件系统，类似于AUFS，但速度更快，更加稳定。这里推荐新版的overlay2。
要求：
overlay2： Linux内核版本4.0或更高版本，或使用内核版本3.10.0-514+的RHEL或CentOS
支持的磁盘文件系统：ext4(仅限RHEL 7.1)，xfs(RHEL7.2及更高版本)，需要启用d_type=true
编辑/etc/docker/daemon.json加入以下内容
{
"storage-driver": "overlay2","storage-opts": ["overlay2.override_kernel_check=true"]
}
配置日志驱动(可选)
容器在运行时会产生大量日志文件，很容易占满磁盘空间。通过配置日志驱动来限制文件大小与文件的数量。 >限制单个日志文件为100M,最多产生3个日志文件
{
"log-driver": "json-file","log-opts": {
"max-size": "100m","max-file": "3"
}
}
daemon.json的样例
{
"registry-mirrors": ["https://z34wtdhg.mirror.aliyuncs.com"],"insecure-registries":["harbor.httpshop.com","bh-harbor.suixingpay.com"],"storage-driver": "overlay2","storage-opts": ["overlay2.override_kernel_check=true"]
}
{
"log-driver": "json-file","max-file": "3"
}
}
[[email protected] ~]# grep ^docker /etc/group 如果有docker组就不需要创建 docker:x:994: useradd -g docker docker echo "1" | passwd --stdin docker
ssh-keygen -t rsa ssh-copy-id -i ~/.ssh/id_rsa.pub [email protected] ssh-copy-id -i ~/.ssh/id_rsa.pub [email protected] ssh-copy-id -i ~/.ssh/id_rsa.pub [email protected] ssh-copy-id -i ~/.ssh/id_rsa.pub [email protected]
[[email protected] ~]$ cat /etc/Nginx/Nginx.conf worker_processes auto; pid /run/Nginx.pid; events { use epoll; worker_connections 65536; accept_mutex off; } http { log_format main ‘$remote_addr - $remote_user [$time_local] "$upstream_addr" "$request" ‘ ‘$status $body_bytes_sent "$http_referer" ‘ ‘"$http_user_agent" "$http_x_forwarded_for" "$request_time"‘; sendfile on; tcp_nopush on; tcp_nodelay on; keepalive_timeout 900; # keepalive_timeout 0; keepalive_requests 100; types_hash_max_size 2048; server { listen 80; return 301 https://$host$request_uri; } } stream { upstream rancher_servers { least_conn; server 10.0.0.100:443 max_fails=3 fail_timeout=5s; } server { listen 443; proxy_pass rancher_servers; } }
启动docker服务:
docker run -d --restart=unless-stopped -p 80:80 -p 443:443 -v /etc/Nginx/Nginx.conf:/etc/Nginx/Nginx.conf Nginx:1.14
下载RKE wget https://github.com/rancher/rke/releases/download/v0.1.11/rke_linux-amd64 (不建议在不能×××的机器上安装,我们可以下载下来传上去)
nodes:
- address: 10.0.0.100
user: docker
ssh_key_path: ~/.ssh/id_rsa
role: [controlplane,worker,etcd]
- address: 10.0.0.101
user: docker
role: [worker,etcd]
- address: 10.0.0.102
user: docker
role: [worker,etcd]
services:
etcd:
snapshot: true
creation: 6h
retention: 24h
yum -y install kubectl
检查集群节点:
[[email protected] ~]$ kubectl get nodes NAME STATUS ROLES AGE VERSION 10.0.0.100 Ready controlplane,etcd,worker 2h v1.11.3 10.0.0.101 Ready etcd,worker 2h v1.11.3 10.0.0.102 Ready etcd,worker 2h v1.11.3
检查pod状态
[[email protected] ~]$ kubectl get pods --all-namespaces NAMESPACE NAME READY STATUS RESTARTS AGE ingress-Nginx default-http-backend-797c5bc547-j7577 1/1 Running 0 2h ingress-Nginx nginx-ingress-controller-69s9g 1/1 Running 0 2h ingress-Nginx nginx-ingress-controller-8gw74 1/1 Running 0 2h ingress-Nginx nginx-ingress-controller-xgzzw 1/1 Running 0 2h kube-system canal-5nf7c 3/3 Running 0 2h kube-system canal-nzgx4 3/3 Running 0 2h kube-system canal-t5m9d 3/3 Running 0 2h kube-system kube-dns-7588d5b5f5-s5f99 3/3 Running 0 2h kube-system kube-dns-autoscaler-5db9bbb766-62rxm 1/1 Running 0 2h kube-system metrics-server-97bc649d5-9h2g4 1/1 Running 0 2h kube-system rke-ingress-controller-deploy-job-rwzgq 0/1 Completed 0 2h kube-system rke-kubedns-addon-deploy-job-mvmzj 0/1 Completed 0 2h kube-system rke-metrics-addon-deploy-job-52gp4 0/1 Completed 0 2h kube-system rke-network-plugin-deploy-job-jckhc 0/1 Completed 0 2h
Pods的STATUS是Completed为run-one Jobs,这些pods READY应该为0/1。
yum -y install bash-completion.noarch source <(kubectl completion bash) echo "source <(kubectl completion bash)" >> ~/.bashrc
# 在kube-system这个命令空间里面创建一个 tiller的服务账号 kubectl -n kube-system create serviceaccount tiller # 把tiller绑定到哪个集群角色上面,服务账号是什么 kubectl create clusterrolebinding tiller --clusterrole cluster-admin --serviceaccount=kube-system:tiller
下载安装包的地址为 : https://github.com/helm/helm/releases
[[email protected] ~]$ tar xf helm-v2.12.2-linux-amd64.tar.gz [[email protected] ~]# cp -a -t /usr/local/bin/ /home/docker/linux-amd64/helm /home/docker/linux-amd64/tiller [[email protected] ~]# su - docker
helm repo add rancher-stable https://releases.rancher.com/server-charts/stable
默认使用的版本是V2.12.3
helm init --service-account tiller --tiller-image registry.cn-hangzhou.aliyuncs.com/google_containers/tiller:v2.12.3 --stable-repo-url https://kubernetes.oss-cn-hangzhou.aliyuncs.com/charts
helm install stable/cert-manager --name cert-manager --namespace kube-system
如果报错,在后面添加--set createCustomResource=true
helm install rancher-stable/rancher --name rancher --namespace cattle-system --set hostname=rancher.zsf.com
我们在hosts文件里面加入对应的域名解析,因为我们的域名是假的
cat /etc/hosts 10.0.0.99 rancher.zsf.com
登录的时候需要注意,使用https协议访问,这个过程的长短根据你的机器配置来的,
注意:
当你即将升级Rancher或将其恢复到以前的快照时，你应该对数据手动创建快照，以便数据异常时可供恢复。
在RKE机器上执行下面命令
./rke_linux-amd64 etcd snapshot-save --name <SNAPSHOT.db> --config rancher-cluster.yml
SNAPSHOT.db: 这个是保存etcd的快照名字rancher-cluster.yml: 这个是创建集群的时候指定的配置文件,如果使用的是默认的cluster.yml就可以不指定
RKE会获取每个etcd节点的快照，并保存在每个etcd节点的/opt/rke/etcd-snapshots目录下；
测试:
[[email protected] ~]$ pwd /home/docker [[email protected] ~]$ ls cluster.yml kube_config_cluster.yml linux-amd64 rke_linux-amd64 [[email protected] ~]$ ./rke_linux-amd64 etcd snapshot-save --name initialization_status_20190213 --config cluster.yml INFO[0000] Starting saving snapshot on etcd hosts INFO[0000] [dialer] Setup tunnel for host [10.0.0.100] INFO[0000] [dialer] Setup tunnel for host [10.0.0.101] INFO[0000] [dialer] Setup tunnel for host [10.0.0.102] INFO[0000] [etcd] Saving snapshot [initialization_status_20190213] on host [10.0.0.100] INFO[0000] [etcd] Successfully started [etcd-snapshot-once] container on host [10.0.0.100] INFO[0000] [etcd] Saving snapshot [initialization_status_20190213] on host [10.0.0.101] INFO[0001] [etcd] Successfully started [etcd-snapshot-once] container on host [10.0.0.101] INFO[0001] [etcd] Saving snapshot [initialization_status_20190213] on host [10.0.0.102] INFO[0001] [etcd] Successfully started [etcd-snapshot-once] container on host [10.0.0.102] INFO[0002] [certificates] Successfully started [rke-bundle-cert] container on host [10.0.0.100] INFO[0002] [certificates] Successfully started [rke-bundle-cert] container on host [10.0.0.102] INFO[0002] [certificates] Successfully started [rke-bundle-cert] container on host [10.0.0.101] INFO[0002] [certificates] successfully saved certificate bundle [/opt/rke/etcd-snapshots//pki.bundle.tar.gz] on host [10.0.0.101] INFO[0002] [certificates] successfully saved certificate bundle [/opt/rke/etcd-snapshots//pki.bundle.tar.gz] on host [10.0.0.100] INFO[0002] [certificates] successfully saved certificate bundle [/opt/rke/etcd-snapshots//pki.bundle.tar.gz] on host [10.0.0.102] INFO[0002] Finished saving snapshot [initialization_status_20190213] on all etcd hosts
到节点上去看
[[email protected] etcd-snapshots]$ ll -d /opt/rke/etcd-snapshots/initialization_status_20190213 -rw-r--r-- 1 root root 9052192 Feb 13 10:25 /opt/rke/etcd-snapshots/initialization_status_20190213
定时自动创建快照服务是RKE附带的服务，默认没有开启。可以通过在rancher-cluster.yml中添加配置来启用etcd-snapshot(定时自动创建快照)服务。
在cluster.yml文件里面添加如下代码
services:
etcd:
snapshot: true # 是否启用快照功能，默认false；
creation: 6h0s # 快照创建间隔时间，不加此参数，默认5分钟；
retention: 24h # 快照有效期，此时间后快照将被删除；
运行命令./rke_linux-amd64 up --config cluster.yml
结果:
RKE会在每个etcd节点上定时获取快照，并将快照将保存到每个etcd节点的:/opt/rke/etcd-snapshots/目录下
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