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    {
      "parent_author": "osoulmate",
      "parent_permlink": "kubernetes-v1-10-keepalived-ha",
      "author": "steemitboard",
      "permlink": "steemitboard-notify-osoulmate-20190402t105211000z",
      "title": "",
      "body": "Congratulations @osoulmate! You received a personal award!\n\n<table><tr><td>https://steemitimages.com/70x70/http://steemitboard.com/@osoulmate/birthday1.png</td><td>Happy Birthday! - You are on the Steem blockchain for 1 year!</td></tr></table>\n\n<sub>_You can view [your badges on your Steem Board](https://steemitboard.com/@osoulmate) and compare to others on the [Steem Ranking](http://steemitboard.com/ranking/index.php?name=osoulmate)_</sub>\n\n\n###### [Vote for @Steemitboard as a witness](https://v2.steemconnect.com/sign/account-witness-vote?witness=steemitboard&approve=1) to get one more award and increased upvotes!",
      "json_metadata": "{\"image\":[\"https://steemitboard.com/img/notify.png\"]}"
    }
  ]
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      "parent_author": "",
      "parent_permlink": "kubernetes",
      "author": "osoulmate",
      "permlink": "kubernetes-v1-10-keepalived-ha",
      "title": "Kubernetes v1.10+Keepalived HA集群墙内部署实践",
      "body": "导读：众所周知，K8S安装难点在于镜像下载。查询网上许多关于K8S安装部署的文章，作者要么是将镜像下载使用的工作交给了读者完成，要么是放在共享云盘中，由读者下载后导入使用。都知道，如果你不是该云盘提供商的会员，镜像下载速度堪比蜗牛。总之，三个字：”不方便“。基于最大化便利刚接触K8S的同行快速上手实践的目的，在参阅了众多同行关于K8S部署的文章，并经过反复实验验证后，将本人的实验成果在这里分享，希望可以帮助有需要的朋友。由于时间仓促，一些对本文撰写有价值的文章没有仔细考证作者和出处，在本文末尾的参阅文章中可能没有注明。如你发现本文中一些内容的原创属于你本人，请邮件联系本人处理。并在此感谢对本文创作产生帮助的作者。谢谢！\n\n本文K8S集群高可用方案采用Keepalived。\n\n实验环境：\n1、3台centos 1611版本虚拟机，mini安装。Linux localhost 3.10.0-514.el7.x86_64 #1 SMP Tue Nov 22 16:42:41 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux\n\n2、docker version\nClient:\nVersion: 1.13.1\nAPI version: 1.26\nPackage version: \nGo version: go1.8.3\nGit commit: 774336d/1.13.1\nBuilt: Wed Mar 7 17:06:16 2018\nOS/Arch: linux/amd64\n\nServer:\nVersion: 1.13.1\nAPI version: 1.26 (minimum version 1.12)\nPackage version:\nGo version: go1.8.3\nGit commit: 774336d/1.13.1\nBuilt: Wed Mar 7 17:06:16 2018\nOS/Arch: linux/amd64\nExperimental: false\n\n3、etcd Version: 3.1.13\n\n4、kubeadm，kubelet，kubectl，kube-cni版本如下：\n-rw-r–r– 1 root root 18176678 Mar 30 00:08 5844c6be68e95a741f1ad403e5d4f6962044be060bc6df9614c2547fdbf91ae5-kubelet-1.10.0-0.x86_64.rpm\n-rw-r–r– 1 root root 17767206 Mar 30 00:07 8b0cb6654a2f6d014555c6c85148a5adc5918de937f608a30b0c0ae955d8abce-kubeadm-1.10.0-0.x86_64.rpm\n-rw-r–r– 1 root root 7945458 Mar 30 00:07 9ff2e28300e012e2b692e1d4445786f0bed0fd5c13ef650d61369097bfdd0519-kubectl-1.10.0-0.x86_64.rpm\n-rw-r–r– 1 root root 9008838 Mar 5 21:56 fe33057ffe95bfae65e2f269e1b05e99308853176e24a4d027bc082b471a07c0-kubernetes-cni-0.6.0-0.x86_64.rpm\n\n5、k8s网络组件：flannel:v0.10.0-amd64\n\n6、实验网络规划如下：\nhost1 172.18.0.154/22\nhost2 172.18.0.155/22\nhost3 172.18.0.156/22\nVIP 172.18.0.192/22\n\n文章视频链接：https://pan.baidu.com/s/1XVagd765eGacuoR_cgesiQ\n\n安装步骤：\n\n0、请先从该链接下载后面步骤所需脚本https://pan.baidu.com/s/1oK7PRLeeYHrouNCRgIQlcQ\n\n1、在3台主机中执行基础环境配置脚本 base-env-config.sh。\n\n2、在主机1执行脚本 host1-base-env.sh\n\n3、在主机2执行脚本 host2-base-env.sh\n\n4、在主机3执行脚本 host3-base-env.sh\n\n5、在host1主机执行如下命令\n[root@host1 ~]# scp -r /etc/etcd/ssl [email protected]:/etc/etcd/\n\n[root@host1 ~]# scp -r /etc/etcd/ssl [email protected]:/etc/etcd/\n\n6、在3台主机中分别执行脚本 etcd.sh\n\n7、查看keepalived状态\nsystemctl status keepalived\n\n8、查看etcd运行状态\n在host1,host2,host3分别执行如下命令：\netcdctl --endpoints=https://${NODE_IP}:2379 --ca-file=/etc/etcd/ssl/ca.pem --cert-file=/etc/etcd/ssl/etcd.pem --key-file=/etc/etcd/ssl/etcd-key.pem cluster-health\n\n9、在3台主机上安装kubeadm,kubelet,kubctl,docker\nyum install kubelet kubeadm kubectl kubernetes-cni docker -y\n\n10、在3台主机禁用docker启动项参数关于SELinux的设置\nsed -i 's/--selinux-enabled/--selinux-enabled=false/g' /etc/sysconfig/docker\n\n11、在3台主机的kubelet配置文件中添加如下参数\nsed -i '9a\\Environment=\"KUBELET_EXTRA_ARGS=--pod-infra-container-image=registry.cn-hangzhou.aliyuncs.com/osoulmate/pause-amd64:3.0\"' /etc/systemd/system/kubelet.service.d/10-kubeadm.conf\n\n12、在3台主机添加docker加速器配置（可选步骤）\ncat << > /etc/docker/daemon.json\n{\n“registry-mirrors”: [“https://yourself.mirror.aliyuncs.com”] #请自行申请阿里云账号获取镜像加速链接\n}\n\n13、在3台主机分别执行以下命令\nsystemctl daemon-reload\nsystemctl enable docker && systemctl restart docker\nsystemctl enable kubelet && systemctl restart kubelet\n\n14、在3台主机中分别执行kubeadmconfig.sh生成配置文件config.yaml\n\n15、在host1主机中首先执行kubeadm初始化操作\n命令如下：\nkubeadm init –config config.yaml\n\n16、在host1主机中执行初始化后操作\nmkdir -p $HOME/.kube\nsudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config\nsudo chown $(id -u):$(id -g) $HOME/.kube/config\n\n17、将主机host1中kubeadm初始化后生成的证书和密钥文件拷贝至host2,host3相应目录下\nscp -r /etc/kubernetes/pki [email protected]:/etc/kubernetes/\nscp -r /etc/kubernetes/pki [email protected]:/etc/kubernetes/\n\n18、为主机host1安装网络组件 podnetwork【这里选用flannel】\nkubectl apply -f https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml\nsystemctl stop kubelet #由于kubelet会调用docker到默认url【谷歌】下载镜像，所以先禁用\nsystemctl restart docker\ndocker pull registry.cn-hangzhou.aliyuncs.com/osoulmate/flannel:v0.10.0-amd64\nsystemctl start kubelet\n\n19、在host2,host3上执行如下命令\nkubeadm init –config config.yaml\nmkdir -p $HOME/.kube\nsudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config\nsudo chown $(id -u):$(id -g) $HOME/.kube/config\n\nkubectl apply -f https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml\nsystemctl stop kubelet #如果提示需要systemctl daemon-reload，则将守护进程重启后再停止kubelet服务。\nsystemctl restart docker\ndocker pull registry.cn-hangzhou.aliyuncs.com/osoulmate/flannel:v0.10.0-amd64\nsystemctl start kubelet\n\n20、查看集群各节点状态【这里仅在host1主机查看结果】\n[root@host1 ~]# kubectl get nodes\nNAME STATUS ROLES AGE VERSION\nhost1 Ready master 5m v1.10.0\nhost2 Ready master 1m v1.10.0\nhost3 Ready master 1m v1.10.0\n[root@host1 ~]# kubectl get po –all-namespaces\nNAMESPACE NAME READY STATUS RESTARTS AGE\nkube-system coredns-7997f8864c-k9dcx 1/1 Running 0 5m\nkube-system coredns-7997f8864c-sv9rv 1/1 Running 0 5m\nkube-system kube-apiserver-host1 1/1 Running 1 4m\nkube-system kube-apiserver-host2 1/1 Running 0 1m\nkube-system kube-apiserver-host3 1/1 Running 0 1m\nkube-system kube-controller-manager-host1 1/1 Running 1 4m\nkube-system kube-controller-manager-host2 1/1 Running 0 1m\nkube-system kube-controller-manager-host3 1/1 Running 0 1m\nkube-system kube-flannel-ds-88tz5 1/1 Running 0 1m\nkube-system kube-flannel-ds-g9dpj 1/1 Running 0 2m\nkube-system kube-flannel-ds-h58tp 1/1 Running 0 1m\nkube-system kube-proxy-6fsvq 1/1 Running 1 5m\nkube-system kube-proxy-g8xnb 1/1 Running 1 1m\nkube-system kube-proxy-gmqv9 1/1 Running 1 1m\nkube-system kube-scheduler-host1 1/1 Running 1 5m\nkube-system kube-scheduler-host2 1/1 Running 1 1m\nkube-system kube-scheduler-host3 1/1 Running 0 1m\n\n21、高可用验证\n将host1关机，在host3上执行\nwhile true; do sleep 1; kubectl get node;date; done\n在host2上观察keepalived是否已切换为主状态。\n\nQ&A\n\n1、为什么在kubeadm init时出现kubelet 版本不支持系统中安装的etcd的报错？\n\n因为本文k8s管理组件kubeadm,kubectl,kubelet的安装源为阿里云源，阿里云源会和最新k8s版本保持同步。如出现版本不兼容的问题，请按照报错提示安装相应版本的etcd或kubelet，kubeadm,kubectl组件。\n\n2、为什么安装时间同步软件chrony？\n\n由于集群采用keepalived检测集群各节点的活动状态，如不能保证各节点时间同步，会导致心跳异常，进而影响集群的故障倒换。当然，你也可以采用其它时间同步措施，只要能保证各节点之间的时间同步即可。\n\n3、步骤18中为什么用kubectl应用了网络组件后还要用docker pull从阿里云拉取镜像呢？\n\nkubectl应用了flannel组件后默认会从谷歌镜像库中拉取镜像，所以要先停止kubelet服务，使其停止对docker的调用，在我们手动从阿里云拉取镜像后，再重启kubelet服务，k8s相关服务会自动识别镜像。在host2,host3主机kubeadm init完成后可能还会出现其它镜像包未拉取完成的情况，这时也可以采用这种方法：即停止kubelet服务，重启docker服务，手动拉取镜像【确定需要拉取那些镜像可先在主机上使用 kubectl get po –all-namespaces命令获取各主机镜像的当前状态。如READY列显示0/1表示镜像仍在拉取/创建中，可使用你下载的k8s压缩包中名称为阿里云镜像包的txt文档中的相应命令】，之后再启动kubelet服务。除flannel镜像外，理论上所有镜像在kubeadm init中都会从阿里云镜像库中拉取，所以，如果host2,host3在kubeadm init时有镜像没有拉取完成，可等待1-2分钟，如还未成功，直接重启kubelet服务即可。\n\n参考文章：\nhttps://www.kubernetes.org.cn/3536.html \nhttps://docs.docker.com/install/linux/docker-ce/ubuntu/#os-requirements https://kubernetes.io/docs/setup/independent/install-kubeadm/ \nhttps://linux.cn/article-4764-1.html \nhttps://blog.csdn.net/yjk13703623757/article/details/78997157",
      "json_metadata": "{\"tags\":[\"kubernetes\",\"keepalived\"],\"links\":[\"https://pan.baidu.com/s/1XVagd765eGacuoR_cgesiQ\",\"https://pan.baidu.com/s/1oK7PRLeeYHrouNCRgIQlcQ\",\"https://yourself.mirror.aliyuncs.com\",\"https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml\",\"https://www.kubernetes.org.cn/3536.html\",\"https://docs.docker.com/install/linux/docker-ce/ubuntu/#os-requirements\",\"https://kubernetes.io/docs/setup/independent/install-kubeadm/\",\"https://linux.cn/article-4764-1.html\",\"https://blog.csdn.net/yjk13703623757/article/details/78997157\"],\"app\":\"steemit/0.1\",\"format\":\"markdown\"}"
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