這篇文章主要介紹了Linux下實現免密碼登入的相關資料,非常不錯,具有參考借鑒價值,有興趣的朋友一起看看吧
1.Linux下生成密鑰
ssh-keygen的命令手冊,透過」man ssh-keygen“命令:
# 通過命令” ssh-keygen -t rsa「
生成之後會在使用者的根目錄產生一個「.ssh」的資料夾
# 進入「.ssh」會產生以下幾個檔案
authorized_keys:存放遠端免密登入的公鑰,主要透過這個檔案記錄多台機器的公鑰
id_rsa : 產生的私鑰檔案
know_hosts : 已知的主機公鑰清單
如果希望ssh公鑰生效需滿足至少下面兩個條件:
) .ssh/authorized_keys檔案權限必須是6002.遠端免持登入
原理圖:
## 常用以下幾種方法:
2.1 透過ssh-copy-id的方式
指令:
ssh-copy-id -i ~/.ssh/id_rsa.put fe1be4b6c1a31021ce15f9d3346405e5
[root@test .ssh]# ssh-copy-id -i ~/.ssh/id_rsa.pub 192.168.91.135 root@192.168.91.135's password: Now try logging into the machine, with "ssh '192.168.91.135'", and check in: .ssh/authorized_keys to make sure we haven't added extra keys that you weren't expecting. [root@test .ssh]# ssh root@192.168.91.135 Last login: Mon Oct 10 01:25:49 2016 from 192.168.91.133 [root@localhost ~]#常見錯誤: 常見錯誤: [root@test ~]# ssh-copy-id -i ~/.ssh/id_rsa.pub@test ~]# ssh-copy-id -i ~/.ssh/id_rsa.pub@test ~]# ssh-copy-id -i ~/.ssh/id_rsa.pub 192.1685.
# -bash: ssh-copy-id: command not found //提示指令不存在
解決方案:y#y 解決方案 opens-clilld open.透過scp將內容寫到對方的檔案中 指令:
scp -p ~/.ssh/id_rsa.pub root@721b019b2c3c3f62b979c6ee04afb641:/root/.ssh/authorized_keys
舉例:
###[root@test .ssh]# scp -p ~/.ssh/id_rsa.pub root@192.168.91.135:/root/.ssh/authorized_keys root@192.168.91.135's password: id_rsa.pub 100% 408 0.4KB/s 00:00 [root@test .ssh]# [root@test .ssh]# [root@test .ssh]# [root@test .ssh]# ssh root@192.168.91.135 Last login: Mon Oct 10 01:27:02 2016 from 192.168.91.133 [root@localhost ~]########## ######也可以分為兩步操作:########## ##$ scp ~/.ssh/id_rsa.pub root@721b019b2c3c3f62b979c6ee04afb641:pub_key //將檔案拷貝至遠端伺服器###$ cat ~/pub_key >>~/.ssh/authorized_keys //將內容追加到authorized_keys檔案中, 不過要登入遠端伺服器來執行這條指令###### ######2.3 透過Ansible實作批次免密################2.3 透過Ansible實作批次免密############### 2.3.1 將需要做免密操作的機器hosts加到/etc/ansible/hosts下:######### [Avoid close]### 192.168.91.132### 192.168.91.132### 192.168#. 192.168.91.134#########2.3.2 執行指令進行免密操作######### ansible 4179fd5bdbf839b03206a46852a78368 -m authorized_key -a "user=root key='{{groupname> -m authorized_key -a "user=root key='{{ lookup ('file','/root/.ssh/id_rsa.pub') }}'" -k#######範例:#########
[root@test sshpass-1.05]# ansible test -m authorized_key -a "user=root key='{{ lookup('file','/root/.ssh/id_rsa.pub') }}'" -k SSH password: ----->输入密码 192.168.91.135 | success >> { "changed": true, "key": "ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAQEArZI4kxlYuw7j1nt5ueIpTPWfGBJoZ8Mb02OJHR8yGW7A3izwT3/uhkK7RkaGavBbAlprp5bxp3i0TyNxa/apBQG5NiqhYO8YCuiGYGsQAGwZCBlNLF3gq1/18B6FV5moE/8yTbFA4dBQahdtVP PejLlSAbb5ZoGK8AtLlcRq49IENoXB99tnFVn3gMM0aX24ido1ZF9RfRWzfYF7bVsLsrIiMPmVNe5KaGL9kZ0svzoZ708yjWQQCEYWp0m+sODbtGPC34HMGAHjFlsC/SJffLuT/ug/hhCJUYeExHIkJF8OyvfC6DeF7ArI6zdKER7D8M0SM WQmpKUltj2nltuv3w== root@localhost.localdomain", "key_options": null, "keyfile": "/root/.ssh/authorized_keys", "manage_dir": true, "path": null, "state": "present", "unique": false, "user": "root" } [root@test sshpass-1.05]########## ######2.4 手動複製貼上的方式############ 將本地id_rsa.pub檔案的內容拷貝至遠端伺服器的~/.ssh/authorized_keys檔案中##### #################
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