shell 脚本实现 k8s 集群环境下指定 ns 资源的 yaml 文件备份
- 需求说明
- 功能实现
- shell 脚本实现
- shell 使用方式
- 前置工具环境安装
- dump-k8s-yaml.sh 使用方式
- 输入命令 `bash ./dump-k8s-yaml.sh`
- dump-k8s-yaml.sh 应用举例
- dump-k8s-yaml.sh 输出日志信息
- 参考文档
需求说明
在基于 k8s
平台的容器化部署环境中,有时候需要快速的实现部署文件的迁移备份,当 k8s
平台部署一个 app
时,都会相应的产生一堆 yaml
文件,如果 yaml
文件数量较少,我们可以人工手动的方式进行拷贝,但是当 yaml
文件数量多,并且该 k8s
平台部署了多个 app
时,如果在采用人工手动的方式实现这些 yaml
文件的拷贝,可想而知这个工作量是相当多且繁琐的,而这些机械化的人工操作还会产生误差,无法保障文件内容质量,针对这种场景,因此我们采用 shell
脚本来实现快速的 yaml
文件迁移拷贝,相应的提升工作效率并保障 yaml
文件内容质量。
功能实现
实现思路,这里主要是应用了 【bash & kubectl
】组合知识点,实现对 k8s
平台上指定 namespaces
(ns
,命名空间)下指定资源的 yaml
文件拷贝,shell
脚本实现如下:
shell 脚本实现
dump-k8s-yaml.sh
工具 shell
脚本编写如下:
#!/bin/bash
useage(){
echo "Useage:"
echo " bash ./dump-k8s-yaml.sh DUMPDIR KUBECONFIG [NAMESPACE]"
}
if [ $# -lt 1 ];then
useage
exit
fi
dumpDir=$1
KF=$2
NS=$3
resourceList=(
#componentstatuses # cs
configmaps # cm
secrets
persistentvolumeclaims # pvc
events # ev
serviceaccounts # sa
endpoints # ep
services # svc
ingress
daemonsets # ds
deployments # deploy
replicasets # rs
statefulsets # sts
jobs
cronjobs # cj
pods # po
)
showResourceList(){
kubectl --kubeconfig=$KF -n=$NS get nodes
kubectl --kubeconfig=$KF --sort-by=.metadata.name -n=$NS get pods
kubectl --kubeconfig=$KF -n=$NS get cm,secrets,pvc,ev,sa,ep,svc,ingress,ds,deploy,rs,sts,jobs,cj
}
printList(){
for aa in ${resourceList[@]};
do
aList=$(kubectl --kubeconfig=$KF -n=$NS get $aa | grep -v NAME | awk '{print $1}')
if [ ! "${aList[*]}"x == "x" ];then
[ -d $dumpDir/$aa ] || mkdir -p $dumpDir/$aa
for i in $aList;
do
echo $aa $i
kubectl --kubeconfig=$KF -n=$NS get $aa $i -o yaml > $dumpDir/$aa/$i.yaml
done
fi
done
}
zipExec(){
#sudo apt install zip unzip
#zip -v
#unzip -v
zip -r -q $dumpDir.zip file $dumpDir
rm -rf $dumpDir
}
# create namespaces yaml
if [ ! -d $dumpDir ];then
mkdir -p -m 777 ./$dumpDir
fi
kubectl --kubeconfig=$KF get namespaces $NS -o yaml > $dumpDir/$NS.yaml
# create pv yaml
pvList=$(kubectl --kubeconfig=$KF get pv | grep "$NS/" | awk '{print $1}')
if [ ! "${pvList[*]}"x == "x" ];then
[ -d $dumpDir/persistentvolumes ] || mkdir -p $dumpDir/persistentvolumes
for i in ${pvList[@]}
do
echo persistentvolumes $i
kubectl --kubeconfig=$KF get pv $i -o yaml > $dumpDir/persistentvolumes/$i.yaml
done
fi
echo "----[showResourceList]-----------------------"
showResourceList
echo "----[printList]-----------------------"
printList
echo "----[zipExec]-----------------------"
zipExec
echo "export ${NS} ymal completed!"
:<<!
使用方法:
bash dump-k8s-yaml.sh ./demons ./kube.conf demons
举例:
bash ./dump-k8s-yaml.sh ./dotnet-escada ./kube.conf dotnet-escada
!
shell 使用方式
注意:使用此命令,需要获得
kubectl
访问k8s
集群环境的相应权限(即kubeconfig
配置信息);
前置工具环境安装
从上面的 dump-k8s-yaml.sh
文件中可以看到部分工具的依赖,说明如下:
xshell
工具安装(请参照);- 在
shell
终端(此处使用的XShell
)配置好kubectl
工具,并获取到kubeconfig
文件; linux
环境安装文件压缩 & 解压工具zip & unzip
;linux
环境安装lrzsz
工具(说明lrzsz
工具只适合传输小文件,不适合传输大型文件,通常情况 lrzsz 配合 xshell 工具使用);
说明:此处
linux
环境的工具安装命令,适用基于Ubuntu
的发行版,本人使用的环境是Debian 11
。其他linux
发行版请自行查看对应的安装命令即可,下面的dump-k8s-yaml.sh
工具在linux
环境均可通用;
1、配置 kubectl
,并导出 kubeconfig
文件请自行参考相关资料;
2、linux
宿主机没有安装 zip & unzip
工具,执行如下命令:
# linux 安装 zip,unzip:
sudo apt install zip unzip
# 查看版本:
zip -v
unzip -v
# zip 压缩文件:
zip -r -q dump-yaml.zip file ./dump-yaml
# unzip 压缩文件:
unzip dump-yaml.zip
3、linux
宿主机安装 lrzsz
工具,执行如下命令:
sudo apt update && apt install lrzsz
...
XShell 文件上传 & 下载:
# 上传文件:rz
# 单个文件下载:sz file dump-yaml.zip
# 多文文件下载(文件中间使用空格分开):sz file dump-yaml-1.zip dump-yaml-2.zip
dump-k8s-yaml.sh 使用方式
注意:使用【xshell& lrzsz】工具,先把【dump-k8s-yaml.sh】工具上传到 linux 环境,并指定 kubeconfig 文件,此处该文件名称为 kube.conf,和 dump-k8s-yaml.sh 工具是在同一个目录环境下(DUMPDIR 指定方便路径), kubeconfig 文件也可以放在其他路径。
在 linux 宿主机中准备好上面这些基础环境的配置和 shell 客户端工具安装后,接下来我们就可以使用 dump-k8s-yaml.sh
实现 k8s 环境中指定资源的 yaml 文件导出了,使用方式如下:
输入命令 bash ./dump-k8s-yaml.sh
cloud@k8s-node-1:~$ bash ./dump-k8s-yaml.sh
Useage:
bash ./dump-k8s-yaml.sh DUMPDIR KUBECONFIG [NAMESPACE]
- 参数说明:
bash
指定shell
终端类型;./dump-k8s-yaml.sh
当前目录下的dump-k8s-yaml.sh
工具;DUMPDIR
指定.zip
文件路径;KUBECONFIG
指定kubeconfig
文件路径;NAMESPACE
指定 k8s 环境中ns
命名空间名称;
dump-k8s-yaml.sh 应用举例
- 举例:导出
ns
为dotnet-escada
下指定资源的yaml
文件,并保存到当前路径的dotnet-escada
目录中;
bash ./dump-k8s-yaml.sh ./dotnet-escada ./kube.conf dotnet-escada
dump-k8s-yaml.sh 输出日志信息
依据上面使用说明执行命令,输出如下日志结构信息:
persistentvolumes pvc-7a0027c9-84f7-40f9-90b2-929d1514d156
----[showResourceList]-----------------------
NAME READY STATUS RESTARTS AGE
...
----[printList]-----------------------
...
----[zipExec]-----------------------
export dotnet-escada ymal completed!
以上面的【举例】为依据,执行命令输出完整日志信息如下:
cloud@demo-k8s-node-1:~$ bash ./dump-k8s-yaml.sh ./dotnet-escada ./kube.conf dotnet-escada
persistentvolumes pvc-7a0027c9-84f7-40f9-90b2-929d1514d156
----[showResourceList]-----------------------
NAME READY STATUS RESTARTS AGE
deploy-demo-mes-keeperfile-host-75f8878ff7-8q98x 1/1 Running 2 27h
deploy-demo-mes-redis-55fc5dd9cc-6vtkh 1/1 Running 2 27h
deploy-demo-nginx-host-ddddfc864-zxkjb 1/1 Running 5 27h
deploy-demo-smartworx-plugs-host-5d9bd5c99c-rgtxh 0/1 Evicted 0 28h
NAME DATA AGE
configmap/demo-mes-authentication-service-config 1 30h
configmap/demo-mes-config 1 30h
configmap/demo-mes-keeper-appseetings 2 30h
configmap/demo-mes-nginx-config 1 29h
configmap/demo-mes-nginx-service-config 1 29h
configmap/demo-mes-redis-service-config 1 27h
configmap/kube-root-ca.crt 1 31h
NAME TYPE DATA AGE
secret/ceph-kubernetes-dynamic-user-01847765-90af-11ed-bbdc-06eca119f7b2-secret Opaque 1 31h
secret/default-token-k85zv kubernetes.io/service-account-token 3 31h
NAME STATUS VOLUME CAPACITY ACCESS MODES STORAGECLASS AGE
persistentvolumeclaim/pvc-demo-escada-data Bound pvc-7a0027c9-84f7-40f9-90b2-929d1514d156 10Gi RWO cephfs 31h
LAST SEEN TYPE REASON OBJECT MESSAGE
3m24s Normal Sync ingress/escada-inkelink-com Scheduled for sync
3m22s Normal Sync ingress/escada-inkelink-com Scheduled for sync
NAME SECRETS AGE
serviceaccount/default 1 31h
NAME ENDPOINTS AGE
endpoints/demo-mes-keeperfile-host 10.44.0.12:80 28h
endpoints/demo-mes-redis 10.44.0.45:6379 27h
endpoints/demo-nginx-host 10.44.0.20:80 27h
endpoints/demo-scada-base-host <none> 28h
endpoints/demo-smartworx-host <none> 28h
endpoints/demo-smartworx-plugs-host <none> 28h
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
service/demo-mes-keeperfile-host ClusterIP 10.108.90.134 <none> 80/TCP 28h
service/demo-mes-redis ClusterIP 10.99.71.77 <none> 6379/TCP 27h
service/demo-nginx-host LoadBalancer 10.108.145.181 10.23.4.193 80:31995/TCP 27h
service/demo-scada-base-host ClusterIP 10.110.121.140 <none> 80/TCP 28h
service/demo-smartworx-host ClusterIP 10.110.63.82 <none> 80/TCP 28h
service/demo-smartworx-plugs-host ClusterIP 10.105.115.242 <none> 80/TCP 28h
NAME CLASS HOSTS ADDRESS PORTS AGE
ingress.networking.k8s.io/escada-inkelink-com nginx escada.inkelink.com 10.23.4.192 80 27h
NAME READY UP-TO-DATE AVAILABLE AGE
deployment.apps/deploy-demo-mes-keeperfile-host 1/1 1 1 28h
deployment.apps/deploy-demo-mes-redis 1/1 1 1 27h
deployment.apps/deploy-demo-nginx-host 1/1 1 1 27h
deployment.apps/deploy-demo-scada-base-host 0/0 0 0 28h
deployment.apps/deploy-demo-smartworx-host 0/0 0 0 28h
deployment.apps/deploy-demo-smartworx-plugs-host 0/0 0 0 28h
NAME DESIRED CURRENT READY AGE
replicaset.apps/deploy-demo-mes-keeperfile-host-75f8878ff7 1 1 1 28h
replicaset.apps/deploy-demo-mes-redis-55fc5dd9cc 1 1 1 27h
replicaset.apps/deploy-demo-nginx-host-ddddfc864 1 1 1 27h
replicaset.apps/deploy-demo-scada-base-host-6cb55ccd97 0 0 0 28h
replicaset.apps/deploy-demo-smartworx-host-7df5945c7 0 0 0 28h
replicaset.apps/deploy-demo-smartworx-host-856db4cd49 0 0 0 28h
replicaset.apps/deploy-demo-smartworx-host-9c5ff7859 0 0 0 26h
replicaset.apps/deploy-demo-smartworx-plugs-host-5d9bd5c99c 0 0 0 28h
NAME READY STATUS RESTARTS AGE
pod/deploy-demo-mes-keeperfile-host-75f8878ff7-8q98x 1/1 Running 2 27h
pod/deploy-demo-mes-redis-55fc5dd9cc-6vtkh 1/1 Running 2 27h
pod/deploy-demo-nginx-host-ddddfc864-zxkjb 1/1 Running 5 27h
pod/deploy-demo-smartworx-plugs-host-5d9bd5c99c-rgtxh 0/1 Evicted 0 28h
----[printList]-----------------------
configmaps demo-mes-authentication-service-config
configmaps demo-mes-config
configmaps demo-mes-keeper-appseetings
configmaps demo-mes-nginx-config
configmaps demo-mes-nginx-service-config
configmaps demo-mes-redis-service-config
configmaps kube-root-ca.crt
secrets ceph-kubernetes-dynamic-user-01847765-90af-11ed-bbdc-06eca119f7b2-secret
secrets default-token-k85zv
persistentvolumeclaims pvc-demo-escada-data
events LAST
Error from server (NotFound): events "LAST" not found
events 3m26s
Error from server (NotFound): events "3m26s" not found
events 3m24s
Error from server (NotFound): events "3m24s" not found
serviceaccounts default
endpoints demo-mes-keeperfile-host
endpoints demo-mes-redis
endpoints demo-nginx-host
endpoints demo-scada-base-host
endpoints demo-smartworx-host
endpoints demo-smartworx-plugs-host
services demo-mes-keeperfile-host
services demo-mes-redis
services demo-nginx-host
services demo-scada-base-host
services demo-smartworx-host
services demo-smartworx-plugs-host
ingress escada-inkelink-com
No resources found in demo-dotnet-escada namespace.
deployments deploy-demo-mes-keeperfile-host
deployments deploy-demo-mes-redis
deployments deploy-demo-nginx-host
deployments deploy-demo-scada-base-host
deployments deploy-demo-smartworx-host
deployments deploy-demo-smartworx-plugs-host
replicasets deploy-demo-mes-keeperfile-host-75f8878ff7
replicasets deploy-demo-mes-redis-55fc5dd9cc
replicasets deploy-demo-nginx-host-ddddfc864
replicasets deploy-demo-scada-base-host-6cb55ccd97
replicasets deploy-demo-smartworx-host-7df5945c7
replicasets deploy-demo-smartworx-host-856db4cd49
replicasets deploy-demo-smartworx-host-9c5ff7859
replicasets deploy-demo-smartworx-plugs-host-5d9bd5c99c
No resources found in demo-dotnet-escada namespace.
No resources found in demo-dotnet-escada namespace.
No resources found in demo-dotnet-escada namespace.
pods deploy-demo-mes-keeperfile-host-75f8878ff7-8q98x
pods deploy-demo-mes-redis-55fc5dd9cc-6vtkh
pods deploy-demo-nginx-host-ddddfc864-zxkjb
pods deploy-demo-smartworx-plugs-host-5d9bd5c99c-rgtxh
----[zipExec]-----------------------
export dotnet-escada ymal completed!
dump-k8s-yaml.sh
执行完成后,在当前环境目录下会生成一个对应的 .zip
压缩文件,上面例子中对应产生的文件是 dotnet-escada.zip
,此时我们可以利用【xshell & lrzsz
】工具下载 dotnet-escada.zip
文件,执行命令如下:
sz file dotnet-escada.zip
参考文档
- kubectl 命令行工具,https://kubernetes.io/zh-cn/docs/reference/kubectl/