2018-10-09 ssh 免密登录以及备份

服务器 A

ssh-keygen -t rsa
# generate id_rsa.pub， copy it to server B

服务器 B,

mv id_rsa.pub  ~/.ssh/authorized_keys 
# 如果有多个服务器连接 cat  id_rsa.pub >>  ~/.ssh/authorized_keys
# cat  ~/.ssh/id_rsa.pub >>  ~/.ssh/authorized_keys
chmod 700 ~/.ssh/
chmod 600 ~/.ssh/authorized_keys 

这样 服务器 A就可以免密登录服务器B

ssh nong@222.200.186.169

反之亦然~

备份, rsync 进行备份， crontab 定时执行
vim /data2/nong/bak_161/crontab.txt

0 2 * * *  rsync -av -l -e ssh nong@222.200.186.161:/public/home/nong/webs/ /data2/nong/bak_161/webs
0 2 * * *  rsync -av -l -e ssh nong@222.200.186.161:/public/home/nong/pipeline /data2/nong/bak_161/pipeline
0 2 * * *  rsync -av -l -e ssh nong@222.200.186.161:/public/home/nong/python /data2/nong/bak_161/python

• -l, --links copy symlinks as symlinks

The first part is "0 2 * * *". This is where we schedule the timer.
The rest of the line is the command as it would run from the command line.

image.png

加入schedule

crontab crontab.txt 
crontab -l

设置远程主机别名
vim ~/.ssh/config

Host jhd
HostName 1xx.1xx.1xx.67
User root
IdentitiesOnly yes

其中：

1. Host 后边的是名称，以后可以根据这个名称进行访问；
2. HostName是你的主机IP地址；
3. User为主机登录的用户名；
4. IdentitiesOnly yes固有配置；