项目笔记：k8s的master节点恢复操作
如果k8s的master节点异常，更新节点设备后，需要对该master节点进行k8s恢复。
场景：k8s高可用环境中，某master节点异常，少了一个master节点，会导致etcd的高可用状态不稳定。所以需要进行该master节点恢复。
自动化恢复脚本
recover_k8s_master.sh
此脚本处理k8s1.14.8版本的master组件恢复，包括：hosts_config、[docker-conf、] etcd、kubelet、master、calico
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| #!/bin/bash
# 此脚本处理k8s1.14.8版本的master组件恢复，包括：hosts_config、[docker-conf、] etcd、kubelet、master、calico
# k8s恢复脚本执行预置条件：
# 1. 新节点已配置待恢复节点的ip和hostname
# 2. 新节点已配置集群节点hosts，并能与原集群节点免密访问
# 3. 新节点已安装了etcd和k8s相关组件
# 4. 已知要执行恢复操作的版本是 v3_1(k8s1.14.8) 还是 v3_2(k8s1.20.5)
# 5. 已知原节点的hostname、ip、etcdname和待恢复节点的hostname、ip、etcdname
stop_commons(){
#systemctl stop harbor
systemctl stop kubelet
systemctl stop etcd
systemctl stop docker
}
start_commons(){
systemctl daemon-reload
systemctl restart docker
#sleep 2s
systemctl restart etcd
sleep 2s
systemctl enable kubelet
systemctl restart kubelet
sleep 5s
}
hosts_config(){
## 1. hosts-conf
set -e
scp -r ${src_ip}:/etc/hosts /etc/hosts
set +e
}
etcd_collect_config(){
# src_ip=10.151.11.61
# new_ip=192.168.100.3
# src_hostname=node1
# new_hostname=node3
# src_etcdname=etcd1
# new_etcdname=etcd3
set -e
scp -r ${src_ip}:/etc/ssl/etcd /home/recover/etc/
set +e
cp -r /etc/ssl/etcd /home/tmp/etcd
rm -rf /etc/ssl/etcd
cp -r /home/recover/etc/etcd /etc/ssl/
## check etcd ssl
# grep_ret=$(ls /etc/ssl/etcd/ssl |grep node1|wc -l)
grep_ret=$(ls /etc/ssl/etcd/ssl |grep ${new_hostname} |wc -l)
if [[ ${grep_ret} == 0 ]]; then
#statements
echo "Failed to etcd_collect_config etcd ssl."
exit 11
fi
## etcd cofig
set -e
scp -r ${src_ip}:/etc/etcd.env /etc/etcd.env
scp -r ${src_ip}:/etc/systemd/system/etcd.service /etc/systemd/system/etcd.service
scp -r ${src_ip}:/usr/local/bin/etcd /usr/local/bin/etcd
scp -r ${src_ip}:/usr/local/bin/etcdctl /usr/local/bin/etcdctl
# scp -r ${src_ip}:/usr/local/bin/etcd-scripts /usr/local/bin/etcd-scripts
set +e
}
etcd_common_config(){
set -e
## vi /etc/etcd.env
etcd_env=/etc/etcd.env
# src_ip=10.151.11.61
# new_ip=192.168.100.3
# src_hostname=node1
# new_hostname=node3
# src_etcdname=etcd1
# new_etcdname=etcd3
# sed -n '/^ETCD_INITIAL_CLUSTER=/!s/'${src_ip}'/'${new_ip}'/gp' ${etcd_env}
sed -i '/^ETCD_INITIAL_CLUSTER=/!s/'${src_ip}'/'${new_ip}'/g' ${etcd_env}
sed -i 's|ETCD_NAME=.*$|ETCD_NAME='${new_etcdname}'|g' ${etcd_env}
sed -i 's|'${src_hostname}'|'${new_hostname}'|g' ${etcd_env}
## vi /etc/systemd/system/etcd.service
etcd_service=/etc/systemd/system/etcd.service
sed -i 's|'${src_etcdname}'|'${new_etcdname}'|g' ${etcd_service}
## vi /usr/local/bin/etcd
etcd_bin=/usr/local/bin/etcd
sed -i 's|'${src_etcdname}'|'${new_etcdname}'|g' ${etcd_bin}
set +e
## config new etcd member
systemctl stop etcd
# ETCDCTL_API=3 etcdctl --endpoints=https://100.7.36.106:2379 --cacert=/etc/ssl/etcd/ssl/ca.pem --cert=/etc/ssl/etcd/ssl/member-node1.pem --key=/etc/ssl/etcd/ssl/member-node1-key.pem member list |grep etcd3 |cut -d"," -f1
rm -rf /var/lib/etcd/
## get new_etcdid
new_etcdid=$(ETCDCTL_API=3 etcdctl --endpoints=https://${src_ip}:2379 --cacert=/etc/ssl/etcd/ssl/ca.pem --cert=/etc/ssl/etcd/ssl/member-${src_hostname}.pem --key=/etc/ssl/etcd/ssl/member-${src_hostname}-key.pem member list |grep ${new_etcdname} |cut -d"," -f1)
if [[ "x"${new_etcdid}"x" == "xx" ]];then
echo "Warning: Failed to find ${new_etcdname} in etcd member list. Check the new_etcdname validity"
exit 12
fi
## remove this new_etcdid member
ETCDCTL_API=3 etcdctl --endpoints=https://${src_ip}:2379 --cacert=/etc/ssl/etcd/ssl/ca.pem --cert=/etc/ssl/etcd/ssl/member-${src_hostname}.pem --key=/etc/ssl/etcd/ssl/member-${src_hostname}-key.pem member remove ${new_etcdid}
## add this new_etcdname member
ETCDCTL_API=3 etcdctl --endpoints=https://${src_ip}:2379 --cacert=/etc/ssl/etcd/ssl/ca.pem --cert=/etc/ssl/etcd/ssl/member-${src_hostname}.pem --key=/etc/ssl/etcd/ssl/member-${src_hostname}-key.pem member add ${new_etcdname} --peer-urls=https://${new_ip}:2380
systemctl daemon-reload
systemctl start docker
systemctl enable etcd
systemctl restart etcd
sleep 15s
## check etcd
ETCDCTL_API=3 etcdctl --endpoints=https://${new_ip}:2379 --cacert=/etc/ssl/etcd/ssl/ca.pem --cert=/etc/ssl/etcd/ssl/member-${new_hostname}.pem --key=/etc/ssl/etcd/ssl/member-${new_hostname}-key.pem member list
echo ""
ETCDCTL_API=3 etcdctl --endpoints=https://${new_ip}:2379 --cacert=/etc/ssl/etcd/ssl/ca.pem --cert=/etc/ssl/etcd/ssl/member-${new_hostname}.pem --key=/etc/ssl/etcd/ssl/member-${new_hostname}-key.pem endpoint status --cluster -w table
echo ""
echo ""
echo ""
}
# config aist-v3.1: etcd v3.3.10
etcd_config_v3_1(){
etcd_common_config
}
# config aist-v3.2: etcd v3.4.13
etcd_config_v3_2(){
etcd_common_config
}
k8s_collect_config(){
# src_ip=10.151.11.61
# new_ip=192.168.100.3
# src_hostname=node1
# new_hostname=node3
# src_etcdname=etcd1
# new_etcdname=etcd3
# 1. 收集k8s etc config
## 备份拷贝到临时目录
cp -r /etc/kubernetes /home/tmp/kubernetes
## 收集配置文件
set -e
scp -r ${src_ip}:/etc/kubernetes /home/recover/kubernetes
set +e
rm -rf /etc/kubernetes
cp -r /home/recover/kubernetes /etc/kubernetes
# 2. 收集kubelet
## 拷贝过程会提示kubelet.sock无法拷贝，无影响
rm -rf /var/lib/kubelet
scp -r ${src_ip}:/var/lib/kubelet /var/lib/kubelet
scp -r ${src_ip}:/etc/systemd/system/kubelet.service /etc/systemd/system/kubelet.service
#3 . 收集cni配置和程序文件
## 备份拷贝到临时目录
cp -r /etc/cni /home/tmp/cni
cp -r /opt/cni /home/tmp/cni
## --cni-conf-dir=/etc/cni/net.d --cni-bin-dir=/opt/cni/bin
## 直接拷贝到目标目录
rm -rf /etc/cni
rm -rf /opt/cni
set -e
scp -r ${src_ip}:/etc/cni /etc/cni
scp -r ${src_ip}:/opt/cni /opt/cni
set +e
}
calico_common_config(){
# src_ip=10.151.11.61
# new_ip=192.168.100.3
# src_hostname=node1
# new_hostname=node3
# src_etcdname=etcd1
# new_etcdname=etcd3
set -e
# vi /etc/cni/net.d/calico.conflist.template /etc/cni/net.d/10-calico.conflist
calico_conflist_template=/etc/cni/net.d/calico.conflist.template
calico_conflist=/etc/cni/net.d/10-calico.conflist
#sed -i 's|"nodename": "'${src_hostname}'"|"nodename": "'${new_hostname}'"|g' ${calico_conflist}
sed -i 's|'${src_hostname}'|'${new_hostname}'|g' ${calico_conflist_template}
sed -i 's|'${src_hostname}'|'${new_hostname}'|g' ${calico_conflist}
# vi /var/lib/calico/nodename
echo "${new_hostname}" > /var/lib/calico/nodename
set +e
rm -rf /var/lib/cni/cache
}
# calico_crerts_config for aist-v3.1: k8s1.14.8
calico_crerts_config(){
calico_cert_dir=/etc/calico/certs
kube_etcd_cacert_file=ca.pem
kube_etcd_cert_file=node-${new_hostname}.pem
kube_etcd_key_file=node-${new_hostname}-key.pem
rm -rf ${calico_cert_dir}
mkdir -p ${calico_cert_dir}
cd /etc/ssl/etcd/ssl
/bin/cp -rf ${kube_etcd_cacert_file} ${calico_cert_dir}/ca_cert.crt
/bin/cp -rf ${kube_etcd_cert_file} ${calico_cert_dir}/cert.crt
/bin/cp -rf ${kube_etcd_key_file} ${calico_cert_dir}/key.pem
# ll ${calico_cert_dir}
grep_ret=$(ls ${calico_cert_dir} |wc -l)
if [[ ${grep_ret} != 3 ]]; then
#statements
echo "Failed to calico_crerts_config crerts."
exit 31
fi
echo ""
echo ""
}
# config aist-v3.1: k8s v1.14.8
calico_config_v3_1(){
calico_common_config
calico_crerts_config
}
# config aist-v3.2: k8s v1.20.5
calico_config_v3_2(){
calico_common_config
}
sysctl_config_v3_2(){
scp -r ${src_ip}:/etc/sysctl.d/bridge-nf-call.conf /etc/sysctl.d/bridge-nf-call.conf
sysctl -p /etc/sysctl.d/bridge-nf-call.conf
}
label_master_node(){
kubectl label --overwrite nodes ${new_hostname} node-role.kubernetes.io/master=true
if [[ $? != 0 ]]; then
#statements
echo "Failed to kubectl label --overwrite nodes ${new_hostname} node-role.kubernetes.io/master=true, and to retry..."
sleep 3s
kubectl label --overwrite nodes ${new_hostname} node-role.kubernetes.io/master=true
fi
}
# config aist-v3.1: k8s v1.14.8
k8s_config_v3_1(){
# src_ip=10.151.11.61
# new_ip=192.168.100.3
# src_hostname=node1
# new_hostname=node3
# src_etcdname=etcd1
# new_etcdname=etcd3
stop_commons
calico_config_v3_1
set -e
## vi /etc/kubernetes/kubelet.env
kubelet_env=/etc/kubernetes/kubelet.env
# kubelet_env=kubelet.env
sed -i 's|--address='${src_ip}'|--address='${new_ip}'|g' ${kubelet_env}
sed -i 's|--node-ip='${src_ip}'|--node-ip='${new_ip}'|g' ${kubelet_env}
sed -i 's|--hostname-override='${src_hostname}'|--hostname-override='${new_hostname}'|g' ${kubelet_env}
## vi /etc/kubernetes/kubeadm-config.yaml
kubeadm_config=/etc/kubernetes/kubeadm-config.yaml
# kubeadm_config=kubeadm-config.yaml
# advertiseAddress: 10.151.11.61
sed -i 's|advertiseAddress: '${src_ip}'|advertiseAddress: '${new_ip}'|g' ${kubeadm_config}
# sed -n 's|^[#]*[ ]*name: '${src_hostname}'| name: '${new_hostname}'|gp' ${kubeadm_config}
# sed -n 's| name: '${src_hostname}'| name: '${new_hostname}'|gp' ${kubeadm_config}
sed -i 's| name: '${src_hostname}'| name: '${new_hostname}'|g' ${kubeadm_config}
# sed -n 's|/etc/ssl/etcd/ssl/node-'${src_hostname}'.pem|/etc/ssl/etcd/ssl/node-'${new_hostname}'.pem|gp' ${kubeadm_config}
# sed -n 's|/etc/ssl/etcd/ssl/node-'${src_hostname}'-key.pem|/etc/ssl/etcd/ssl/node-'${new_hostname}'-key.pem|gp' ${kubeadm_config}
sed -i 's|/etc/ssl/etcd/ssl/node-'${src_hostname}'.pem|/etc/ssl/etcd/ssl/node-'${new_hostname}'.pem|g' ${kubeadm_config}
sed -i 's|/etc/ssl/etcd/ssl/node-'${src_hostname}'-key.pem|/etc/ssl/etcd/ssl/node-'${new_hostname}'-key.pem|g' ${kubeadm_config}
sed -i 's| bind-address: '${src_ip}'| bind-address: '${new_ip}'|g' ${kubeadm_config}
sed -i 's| insecure-bind-address: '${src_ip}'| insecure-bind-address: '${new_ip}'|g' ${kubeadm_config}
sed -i 's|hostnameOverride: '${src_hostname}'|hostnameOverride: '${new_hostname}'|g' ${kubeadm_config}
set +e
## cache delete
rm -rf /etc/kubernetes/admin.conf
rm -rf /etc/kubernetes/kubelet.conf
# 删除kubelet的pki
rm -rf /var/lib/kubelet/pki
# 如果安装包指定kubelet其它数据目录（如：/var/lib/data/kubelet/），则也同样删除
rm -rf /var/lib/data/kubelet/pki
cd /etc/kubernetes
/usr/local/bin/kubeadm init --config=/etc/kubernetes/kubeadm-config.yaml --ignore-preflight-errors=all
echo ""
echo ""
echo ""
# debug
# cat /etc/kubernetes/admin.conf
# cat /etc/kubernetes/kubelet.conf
mkdir -p /root/.kube
sudo /bin/cp -rf /etc/kubernetes/admin.conf /root/.kube/config
start_commons
label_master_node
sleep 5s
}
# config aist-v3.2: k8s v1.20.5
k8s_config_v3_2(){
# src_ip=10.151.11.61
# new_ip=192.168.100.3
# src_hostname=node1
# new_hostname=node3
# src_etcdname=etcd1
# new_etcdname=etcd3
stop_commons
calico_config_v3_2
set -e
## vi /etc/kubernetes/kubelet.env
kubelet_env=/etc/kubernetes/kubelet.env
# kubelet_env=kubelet.env
sed -i 's|--address='${src_ip}'|--address='${new_ip}'|g' ${kubelet_env}
sed -i 's|--node-ip='${src_ip}'|--node-ip='${new_ip}'|g' ${kubelet_env}
sed -i 's|--hostname-override='${src_hostname}'|--hostname-override='${new_hostname}'|g' ${kubelet_env}
## vi /etc/kubernetes/kubeadm-config.yaml
kubeadm_config=/etc/kubernetes/kubeadm-config.yaml
#kubeadm_config=kubeadm-config.yaml
# advertiseAddress: 10.151.11.61
sed -i 's|advertiseAddress: '${src_ip}'|advertiseAddress: '${new_ip}'|g' ${kubeadm_config}
# sed -n 's|^[#]*[ ]*name: '${src_hostname}'| name: '${new_hostname}'|gp' ${kubeadm_config}
# sed -n 's| name: '${src_hostname}'| name: '${new_hostname}'|gp' ${kubeadm_config}
sed -i 's| name: '${src_hostname}'| name: '${new_hostname}'|g' ${kubeadm_config}
# sed -n 's|/etc/ssl/etcd/ssl/node-'${src_hostname}'.pem|/etc/ssl/etcd/ssl/node-'${new_hostname}'.pem|gp' ${kubeadm_config}
# sed -n 's|/etc/ssl/etcd/ssl/node-'${src_hostname}'-key.pem|/etc/ssl/etcd/ssl/node-'${new_hostname}'-key.pem|gp' ${kubeadm_config}
sed -i 's|/etc/ssl/etcd/ssl/node-'${src_hostname}'.pem|/etc/ssl/etcd/ssl/node-'${new_hostname}'.pem|g' ${kubeadm_config}
sed -i 's|/etc/ssl/etcd/ssl/node-'${src_hostname}'-key.pem|/etc/ssl/etcd/ssl/node-'${new_hostname}'-key.pem|g' ${kubeadm_config}
sed -i 's| bind-address: '${src_ip}'| bind-address: '${new_ip}'|g' ${kubeadm_config}
# k8s1.20.5: insecure-bind-address=0
# sed -i 's| insecure-bind-address: '${src_ip}'| insecure-bind-address: '${new_ip}'|g' ${kubeadm_config}
sed -i 's|hostnameOverride: '${src_hostname}'|hostnameOverride: '${new_hostname}'|g' ${kubeadm_config}
set +e
## cache delete
rm -rf /etc/kubernetes/admin.conf
rm -rf /etc/kubernetes/kubelet.conf
# 删除kubelet的pki
rm -rf /var/lib/kubelet/pki
# 如果安装包指定kubelet其它数据目录（如：/var/lib/data/kubelet/），则也同样删除
rm -rf /var/lib/data/kubelet/pki
cd /etc/kubernetes
/usr/local/bin/kubeadm init --config=/etc/kubernetes/kubeadm-config.yaml --ignore-preflight-errors=all
echo ""
echo ""
echo ""
# debug
# cat /etc/kubernetes/admin.conf
# cat /etc/kubernetes/kubelet.conf
mkdir -p /root/.kube
sudo /bin/cp -rf /etc/kubernetes/admin.conf /root/.kube/config
# only for v3_2 基于spray 这个不是必需的了
# sysctl_config_v3_2
start_commons
label_master_node
sleep 5s
}
recover_k8s_v3_1(){
echo "recover_k8s_v3_1 START..."
# 2. etcd
echo "etcd_config ..."
etcd_collect_config
etcd_config_v3_1
# 3. k8s
echo "k8s_config ..."
k8s_collect_config
k8s_config_v3_1
echo "recover_k8s_v3_1 END..."
}
recover_k8s_v3_2(){
echo "recover_k8s_v3_2 START..."
# 2. etcd
echo "etcd_config ..."
etcd_collect_config
etcd_config_v3_2
# 3. k8s
echo "k8s_config ..."
k8s_collect_config
k8s_config_v3_2
echo "recover_k8s_v3_2 END..."
}
k8s_vip_config(){
echo "k8s_vip_config ..."
scp -r ${src_ip}:/etc/kolla/haproxy/k8s.cfg /etc/kolla/haproxy/k8s.cfg
docker restart haproxy
echo "k8s_vip_config END..."
}
k8s_deploy_config(){
echo "k8s_deploy_config ..."
# fix deploy version mismatch bug
if [ ! -f "/etc/kubernetes/coredns-deployment.yml" ];then
cp -r /tmp/coredns-deployment.yml /etc/kubernetes/coredns-deployment.yml
# 100.2.126.55:5000/com.inspur
imageRepository=$(grep imageRepository /etc/kubernetes/kubeadm-images.yaml |cut -d"\"" -f2)
sed -i 's|HARBOR_IP/com.inspur|'${imageRepository}'|g' /etc/kubernetes/coredns-deployment.yml
fi
kubectl delete -f /etc/kubernetes/coredns-deployment.yml
kubectl apply -f /etc/kubernetes/coredns-deployment.yml
echo "k8s_deploy_config END..."
}
######################################
######################################
######################################
# main()
if [[ $# != 7 ]]; then
echo "usage $0 version src_hostname src_ip src_etcdname new_hostname new_ip new_etcdname"
echo "version: v3_1 or v3_2"
echo "for example, recover process: $0 v3_1 node1 192.168.100.1 etcd1 node3 192.168.100.3 etcd3"
exit 1
fi
# check version
if [[ $1 != "v3_1" && $1 != "v3_2" ]]; then
#statements
echo "$0 param:$1 must be 'v3_1' or 'v3_2'"
echo "usage $0 version src_hostname src_ip src_etcdname new_hostname new_ip new_etcdname"
echo "version: v3_1 or v3_2"
echo "for example, recover process: $0 v3_1 node1 192.168.100.1 etcd1 node3 192.168.100.3 etcd3"
exit 2
fi
# params setting
version=$1
src_hostname=$2
src_ip=$3
src_etcdname=$4
new_hostname=$5
new_ip=$6
new_etcdname=$7
# 0. 停止新节点已安装组件
stop_commons
## 1. hosts-conf
hosts_config
## 1. docker-conf
## scp -r node1:/etc/systemd/system/docker.service.d/* /etc/systemd/system/docker.service.d/
## scp -r node1:/etc/systemd/system/docker.service /etc/systemd/system/docker.service
#set -e
#scp -r ${src_ip}:/etc/systemd/system/docker.service.d/* /etc/systemd/system/docker.service.d/
#scp -r ${src_ip}:/etc/systemd/system/docker.service /etc/systemd/system/docker.service
#set +e
#systemctl daemon-reload
## systemctl restart docker
#systemctl enable docker
## check harbor
# echo eb5a7c0df3494817845d1fcd21133afa | docker login -u admin --password-stdin 100.2.126.121:5000
### 停止新节点已安装组件 retry
#stop_commons
# 拷贝到新节node3本地临时目录，临时目录/home/recover/和/home/tmp/在完成全部恢复操作（etcd和k8s）后删除
rm -rf /home/recover/
rm -rf /home/tmp/
mkdir -p /home/recover/
mkdir -p /home/recover/etc/etcd
mkdir -p /home/tmp/
## 2. k8s-conf
if [[ ${version} == "v3_1" ]]; then
recover_k8s_v3_1
### 2.1 k8s_deploy_config
k8s_deploy_config
elif [[ ${action} == "v3_2" ]]; then
recover_k8s_v3_2
fi
## 3. k8s_vip_config
k8s_vip_config
# clear cache tmp dir
rm -rf /home/recover/
rm -rf /home/tmp/
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