SSH免密登录、sudo免密执行

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#ssh #jenkins #运维

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SSH免密登录、sudo免密执行

背景：使用jenkins发布版本时需要远程连接到k8s主节点启动执行kubectl命令，需要解决两个问题：1.ssh远程免密登录，2.sudo免密执行

kubectl apply -f /opt/${JOB_NAME}.yaml
kubectl rollout restart deployment ${JOB_NAME} -n test2

SSH免密登录

# 创建一个普通用户
adduser lijie
# 切换至普通用户
su lijie
cd ~

生成ssh key

lijie@lijie-vm:~$ ssh-keygen -t rsa
Generating public/private rsa key pair.
Enter file in which to save the key (/home/lijie/.ssh/id_rsa): 
Enter passphrase (empty for no passphrase): 
Enter same passphrase again: 
Your identification has been saved in /home/lijie/.ssh/id_rsa
Your public key has been saved in /home/lijie/.ssh/id_rsa.pub
The key fingerprint is:
SHA256:o27B/XKyUXIyyn63ofxdBnSnJSccRofB+SR4NBGOp1o lijie@lijie-vm
The key's randomart image is:
+---[RSA 3072]----+
|             =X*.|
|            .=*+.|
|            o.B++|
|           . + B.|
|     . .S o E .  |
|     .oo.B o .   |
|      +...o   o  |
|     o..+o+o o   |
|     .o.+Bo..    |
+----[SHA256]-----+
lijie@lijie-vm:~$

使用ssh-copy-id命令将id_rsa.pub公钥复制到指定远程服务器的.ssh/authorized_keys文件下

ssh-copy-id  -i ~/.ssh/id_rsa.pub root@localhost

这样就可以直接密码ssh连接远程服务器，并执行命令

ssh root@localhost ip a

sudo免密执行

切换到root用户下，修改/etc/sudoers

su
vim /etc/sudoers

添加一行内容‘lijie ALL=(ALL:ALL) NOPASSWD: ALL’

# User privilege specification
root	ALL=(ALL:ALL) ALL

# Members of the admin group may gain root privileges
%admin ALL=(ALL) ALL

# Allow members of group sudo to execute any command
%sudo	ALL=(ALL:ALL) ALL

lijie   ALL=(ALL:ALL)  NOPASSWD: ALL

使用wq!强制保存退出

普通用户就可以免密使用sudo命令了

远程免密连接普通用户执行sudo命令

ssh test@localhost sudo docker ps

CONTAINER ID   IMAGE                       COMMAND                  CREATED       STATUS                 PORTS                                                                                      NAMES
22496811bd3e   idoop/zentao:latest         "docker-entrypoint"      5 days ago    Up 6 hours (healthy)   0.0.0.0:3306->3306/tcp, :::3306->3306/tcp, 0.0.0.0:8081->80/tcp, :::8081->80/tcp           zentao
3fdb9790eb87   sonarqube:8.9.8-community   "bin/run.sh bin/sona…"   3 weeks ago   Up 6 hours             0.0.0.0:9000->9000/tcp, :::9000->9000/tcp                                                  sonarqube
b4d44c9dd75a   postgres                    "docker-entrypoint.s…"   3 weeks ago   Up 6 hours             0.0.0.0:5432->5432/tcp, :::5432->5432/tcp                                                  db
fafb7fefd312   jenkins/jenkins:2.355       "/usr/bin/tini -- /u…"   3 weeks ago   Up 6 hours             0.0.0.0:8080->8080/tcp, :::8080->8080/tcp, 0.0.0.0:50000->50000/tcp, :::50000->50000/tcp   jenkins

亦可以远程登录k8s主节点并sudo执行命令

ssh lijie@192.168.2.101 sudo kubectl apply -f /opt/${JOB_NAME}.yaml
ssh lijie@192.168.2.101 sudo kubectl rollout restart deployment ${JOB_NAME} -n test2