k8s二进制安装kube-scheduler

Posted 2023-04-17

参考技术A 1、创建csr请求文件，hosts 列表包含所有 kube-scheduler 节点 IP；
CN为system:kube-scheduler、O 为 system:kube-scheduler，kubernetes 内置的 ClusterRoleBindings system:kube-scheduler 将赋予 kube-scheduler 工作所需的权限。

cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=kubernetes kube-scheduler-csr.json | cfssljson -bare kube-scheduler

2、创建kube-scheduler的kubeconfig

设置集群参数

kubectl config set-cluster kubernetes --certificate-authority=ca.pem --embed-certs=true --server=https://135.251.205.109:6443 --kubeconfig=kube-scheduler.kubeconfig

设置客户端认证参数

kubectl config set-credentials system:kube-scheduler --client-certificate=kube-scheduler.pem --client-key=kube-scheduler-key.pem --embed-certs=true --kubeconfig=kube-scheduler.kubeconfig

设置上下文参数

kubectl config set-context system:kube-scheduler --cluster=kubernetes --user=system:kube-scheduler --kubeconfig=kube-scheduler.kubeconfig

设置默认上下文

kubectl config use-context system:kube-scheduler --kubeconfig=kube-scheduler.kubeconfig

3、创建配置文件

4、创建服务启动文件

5、启动服务

cp /root/k8sbinary/TLS/k8s/kube-scheduler.kubeconfig /etc/kubernetes

cp /root/k8sbinary/TLS/k8s/kube-scheduler*.pem /etc/kubernetes/ssl/

systemctl daemon-reload

systemctl enable kube-scheduler

systemctl start kube-scheduler

systemctl status kube-scheduler

systemctl daemon-reload && systemctl restart kube-scheduler

kubernetes集群安装指南：master组件kube-scheduler部署

kube-scheduler集群包含 3 个节点，启动后将通过竞争选举机制产生一个 leader 节点，其它节点为阻塞状态。当 leader 节点不可用后，剩余节点将再次进行选举产生新的 leader 节点，从而保证服务的可用性。

1 安装准备

1.1 环境变量定义

#################### Variable parameter setting ######################
KUBE_NAME=kube-scheduler
K8S_INSTALL_PATH=/data/apps/k8s/kubernetes
K8S_BIN_PATH=$K8S_INSTALL_PATH/sbin
K8S_LOG_DIR=$K8S_INSTALL_PATH/logs
K8S_CONF_PATH=/etc/k8s/kubernetes
KUBE_CONFIG_PATH=/etc/k8s/kubeconfig
CA_DIR=/etc/k8s/ssl
SOFTWARE=/root/software
VERSION=v1.14.2
PACKAGE="kubernetes-server-$VERSION-linux-amd64.tar.gz"
DOWNLOAD_URL=“”https://github.com/devops-apps/download/raw/master/kubernetes/$PACKAGE"
ETCD_ENDPOIDS=https://10.10.10.22:2379,https://10.10.10.23:2379,https://10.10.10.24:2379
ETH_INTERFACE=eth1
LISTEN_IP=$(ifconfig | grep -A 1 $ETH_INTERFACE |grep inet |awk ‘print $2‘)
USER=k8s

1.2 下载和分发 kubernetes 二进制文件

访问kubernetes github 官方地址下载稳定的 realease 包至本机；

wget  $DOWNLOAD_URL -P $SOFTWARE

将kubernetes 软件包分发到各个master节点服务器；

sudo ansible master_k8s_vgs -m copy -a "src=$SOFTWARE/$PACKAGE dest=$SOFTWARE/" -b

2 部署kube-scheduler集群

2.1 安装kube-scheduler二进制文件

### 1.Check if the install directory exists.
if [ ! -d "$K8S_BIN_PATH" ]; then
     mkdir -p $K8S_BIN_PATH
fi

if [ ! -d "$K8S_LOG_DIR/$KUBE_NAME" ]; then
     mkdir -p $K8S_LOG_DIR/$KUBE_NAME
fi

if [ ! -d "$K8S_CONF_PATH" ]; then
     mkdir -p $K8S_CONF_PATH
fi

if [ ! -d "$KUBE_CONFIG_PATH" ]; then
     mkdir -p $KUBE_CONFIG_PATH
fi

### 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>&1
fi
cd $SOFTWARE && tar -xzf kubernetes-server-$VERSION-linux-amd64.tar.gz -C ./
cp -fp kubernetes/server/bin/$KUBE_NAME $K8S_BIN_PATH
ln -sf  $K8S_BIN_PATH/$KUBE_NAM /usr/local/bin
chown -R $USER:$USER $K8S_INSTALL_PATH
chmod -R 755 $K8S_INSTALL_PATH

2.1.3 分发kubeconfig文件和证书文件

分发证书

sudo ansible master_k8s_vgs -m  synchronize -a   "src=$CA_DIR/kube-scheduler*   dest=$K8S_KUBECONFIG_PATH/ mode=push delete=yes rsync_opts=-avz" -b

分发kubeconfig认证文件

kube-scheduler使用 kubeconfig文件连接访问 apiserver服务，该文件提供了 apiserver 地址、嵌入的 CA 证书和 kube-scheduler证书：

sudo ansible master_k8s_vgs -m  synchronize -a   "src=$K8S_KUBECONFIG_PATH/   dest=$K8S_KUBECONFIG_PATH/ mode=push delete=yes rsync_opts=-avz" -b

备注： 如果在前面小节已经同步过各组件kubeconfig和证书文件，此处可以不必执行此操作；

2.1.4 创建kube-scheduler配置文件

cat >$K8S_CONF_PATH/kube-scheduler.yaml<<EOF
apiVersion: kubescheduler.config.k8s.io/v1alpha1
kind: KubeSchedulerConfiguration
bindTimeoutSeconds: 600
clientConnection:
  burst: 200
  kubeconfig: "$KUBE_CONFIG_PATH/$KUBE_NAME.kubeconfig"
  qps: 100
enableContentionProfiling: false
enableProfiling: true
hardPodAffinitySymmetricWeight: 1
healthzBindAddress: 127.0.0.1:10251
leaderElection:
  leaderElect: true
metricsBindAddress: 127.0.0.1:10251
EOF

• --kubeconfig：指定 kubeconfig 文件路径，kube-scheduler 使用它连接和验证 kube-apiserver；
• --leader-elect=true：集群运行模式，启用选举功能；被选为 leader 的节点负责处理工作，其它节点为阻塞状态；
• kubernetes新版本都会以配置文件的形式设置对应的参数；

2.1.4 创建kube-scheduler 启动服务

cat >/usr/lib/systemd/system/$KUBE_NAME.service<<EOF
[Unit]
Description=Kubernetes kube-scheduler Service
Documentation=https://github.com/GoogleCloudPlatform/kubernetes
After=network.target
After=etcd.service
[Service]
User=$USER
WorkingDirectory=$K8S_INSTALL_PATH
ExecStart=$K8S_BIN_PATH/$KUBE_NAME \  --config=/etc/k8s/kubernetes/kube-scheduler.yaml \  --bind-address=$LISTEN_IP \  --secure-port=10259 \  --tls-cert-file=$CA_DIR/kube-scheduler.pem \  --tls-private-key-file=$CA_DIR/kube-scheduler-key.pem \  --kubeconfig=$KUBE_CONFIG_PATH/$KUBE_NAME.kubeconfig \  --authentication-kubeconfig=$KUBE_CONFIG_PATH/$KUBE_NAME.kubeconfig \  --authorization-kubeconfig=$KUBE_CONFIG_PATH/$KUBE_NAME.kubeconfig \  --client-ca-file=$CA_DIR/ca.pem \  --requestheader-allowed-names="" \  --requestheader-client-ca-file=$CA_DIR/ca.pem \  --requestheader-extra-headers-prefix="X-Remote-Extra-" \  --requestheader-group-headers=X-Remote-Group \  --requestheader-username-headers=X-Remote-User \  --leader-elect=true \  --alsologtostderr=true \  --logtostderr=false \  --log-dir=$K8S_LOG_DIR/$KUBE_NAME \  --v=2
Restart=on-failure
RestartSec=5
LimitNOFILE=65536
[Install]
WantedBy=multi-user.target
EOF

检查服务运行状态

systemctl status kube-scheduler|grep Active

确保状态为 active (running)，否则查看日志，确认原因：

sudo journalctl -u kube-scheduler

查看输出的 metrics

注意：以下命令在 kube-scheduler 节点上执行。kube-scheduler 监听 10251 和 10251 端口：

• 10251：接收 http 请求，非安全端口，不需要认证授权；
• 10259：接收 https 请求，安全端口，需要认证授权；
  两个接口都对外提供 /metrics 和 /healthz 的访问。

  sudo netstat -lnpt |grep kube-sch
  tcp   0    0 127.0.0.1:10251       0.0.0.0:*     LISTEN      28786/kube-schedule 
  tcp   0    0 10.10.10.22:10259   0.0.0.0:*     LISTEN      28786/kube-schedule 

查看当前的 leader

kubectl get endpoints kube-scheduler --namespace=kube-system -o yaml

测试 kube-scheduler 集群的高可用

随机找一个或两个 master 节点，停掉 kube-scheduler 服务，看其它节点是否获取了 leader 权限.