Kubernetes Cluster installation Guide: kube-controller-manager component Cluster deployment

Kube-controller-manager belongs to the master node component, and the kube-controller-manager cluster contains three nodes. After startup, one leader node will be generated through the competitive election mechanism, and the other nodes will be in a blocking state. When the leader node is unavailable, the remaining nodes will be elected again to generate a new leader node to ensure the high availability of the service.

1 installation preparation

Special note: all operations here are performed on the devops machine through the ansible tool. Kube-controller-manager uses certificates in the following two cases:

Use to communicate with kube-apiserver 's secure port; output metrics in prometheus format on the secure port (https,10257) 1.1 Environment variable definition # Variable parameter setting # # KUBE_NAME=kube-controller-managerK8S_INSTALL_PATH=/data/apps/k8s/kubernetesK8S_BIN_PATH=$ {K8S_INSTALL_PATH} / sbinK8S_LOG_DIR=$ {K8S_INSTALL_PATH} / logsK8S_CONF_PATH=/etc/k8s/kubernetesKUBE_CONFIG_PATH=/etc/k8s/kubeconfigCA_ DIR=/etc/k8s/sslSOFTWARE=/root/softwareVERSION=v1.14.2PACKAGE= "kubernetes-server-$ {VERSION}-linux-amd64.tar.gz" DOWNLOAD_URL= "" https://github.com/devops-apps/download/raw/master/kubernetes/${PACKAGE}"ETH_INTERFACE=eth2LISTEN_IP=$(ifconfig | grep-A 1 ${ETH_INTERFACE} | grep inet | awk'{print $2}') USER=k8sSERVICE_CIDR=10.254.0.0/221.2 downloads and distributes kubernetes binaries

Visit the official address of kubernetes github to download a stable realease package to this machine

Wget $DOWNLOAD_URL-P $SOFTWARE

Distribute kubernetes packages to each master node server

Sudo ansible master_k8s_vgs-m copy-a "src=$ {SOFTWARE} / $PACKAGE dest=$ {SOFTWARE} /"-b2 deployment kube-controller-manager cluster 2.1 install kube-controller-manager binaries # 1.Check if the install directory exists.if [!-d "$K8S_BIN_PATH"]; then mkdir-p $K8S_BIN_PATHfiif [!-d "$K8S_LOG_DIR/$KUBE_NAME"] Then mkdir-p $K8S_LOG_DIR/$KUBE_NAMEfiif [!-d "$K8S_CONF_PATH"]; then mkdir-p $K8S_CONF_PATHfiif [!-d "$KUBE_CONFIG_PATH"]; then mkdir-p $KUBE_CONFIG_PATHfi### 2.Install kube-apiserver binary of kubernetes.if [!-f "$SOFTWARE/kubernetes-server-$ {VERSION}-linux-amd64.tar.gz"] Then wget $DOWNLOAD_URL-P $SOFTWARE > > / tmp/install.log 2 > & 1ficd $SOFTWARE & & tar-xzf kubernetes-server-$ {VERSION}-linux-amd64.tar.gz-C. / cp-fp kubernetes/server/bin/$KUBE_NAME $K8S_BIN_PATHln-sf $K8S_BIN_PATH/$KUBE_NAM / usr/local/binchown-R $USER:$USER $K8S_INSTALL_PATHchmod-R 755 $K8S_INSTALL_PATH2.2 Distribution kubeconfig File and Certificate Distribution Certificate cd ${CA_DIR} sudo Ansible master_k8s_vgs-m copy-a "src=ca.pem dest=$ {CA_DIR} /"-bsudo ansible master_k8s_vgs-m copy-a "src=ca-key.pem dest=$ {CA_DIR} /"-bsudo ansible master_k8s_vgs-m copy-a\ "src=kubecontroller-manager.pem dest=$ {CA_DIR} /"-bsudo ansible master_k8s_vgs-m copy-a\ "src=kubecontroller-manager-key.pem dest=$ {CA_DIR} /"-b distribute kubeconfig certification files

Kube-controller-manager uses the kubeconfig file connection to access the apiserver service, which provides the apiserver address, embedded CA certificate, and kube-scheduler certificate:

Cd $KUBE_CONFIG_PATHsudo ansible master_k8s_vgs-m copy-a\ "src=kube-controller-manager.kubeconfig dest=$KUBE_CONFIG_PATH/"-b

Note: if you have synchronized the component kubeconfig and certificate files in the previous section, you do not have to do this here

2.3 create the kube-controller-manager startup service cat > / usr/lib/systemd/system/$ {KUBE_NAME} .service