Linux服务器连接另一个linux服务器
ssh root@192.168.0.30//登录
exit //登出
在服务器集群环境中，通过ssh免密码登录
ssh会产生私钥和公钥，对方通过公钥进行加密字符串，然后通过私钥进行解密
在本机生成密钥
[root@iZdpqkd3lvx9ncZ ~]# ssh-keygen //生成密钥
Generating public/private rsa key pair.
Enter file in which to save the key (/root/.ssh/id_rsa):
Enter passphrase (empty for no passphrase):
Enter same passphrase again:
Your identification has been saved in /root/.ssh/id_rsa.
Your public key has been saved in /root/.ssh/id_rsa.pub.
The key fingerprint is:
SHA256:oZ1x3AP1WHCIdxufM35SSeBUPDMMqbKzPr/1hV6mmy0 root@iZdpqkd3lvx9ncZ
The key's randomart image is:
+---[RSA 2048]----+
| .oo*X. |
| ..o=*oB |
| o o.=oo+*|
| o * . ..=o|
| . S o ..o|
| o .o.|
| o ...=|
| o ..E*.|
| ..oo. =+.|
+----[SHA256]-----+
[root@iZdpqkd3lvx9ncZ ~]# ls
[root@iZdpqkd3lvx9ncZ ~]# ls -a
. .bash_history .bash_profile .cache .oracle_jre_usage .pydistutils.cfg .tcshrc
.. .bash_logout .bashrc .cshrc .pip .ssh
[root@iZdpqkd3lvx9ncZ ~]# cd .ssh/
[root@iZdpqkd3lvx9ncZ .ssh]# ls
authorized_keys id_rsa id_rsa.pub
[root@iZdpqkd3lvx9ncZ .ssh]# ll
total 8
-rw------- 1 root root 0 Jun 20 17:22 authorized_keys
-rw------- 1 root root 1679 Jul 16 13:33 id_rsa //密钥
-rw-r--r-- 1 root root 402 Jul 16 13:33 id_rsa.pub //公钥
这里需要注意的是，如果是亚马逊云的服务器，那么通过命令ssh-keygen不一定生成的是RSA的密钥，应当进行指定
ssh-keygen -t dsa
ssh-keygen -t rsa
ssh提供的拷贝方法
拷贝文件
scp abc.txt root@192.168.0.30:/root
拷贝文件夹aaa
scp -r aaa/ root@192.168.0.30:/root
把公钥传送到其他服务器
ssh-copy-id root@192.168.0.30
接着会输入密码
再使用
ssh root@192.168.0.30
时就不用输入密码了
ssh执行命令
ssh root@192.168.0.30 "echo hello > /root/test.txt"
yum工具
搜索
yum list | grep jdk
shell编程
新建一个hello.sh文件
编码
#!/bin/bash
echo "hello world"
运行方式1
[root@iZdpqkd3lvx9ncZ ~]# sh hello.sh
hello world
运行方式2
[root@iZdpqkd3lvx9ncZ ~]# chmod +x hello.sh
[root@iZdpqkd3lvx9ncZ ~]# ./hello.sh
hello world
[root@iZdpqkd3lvx9ncZ ~]#
编码2
#!/bin/bash
read -p "please input yuor name:" NAME
if [ $NAME = ROOT ]
then
echo "hello ${NAME},welcome!"
elif[ $NAME = test ]
echo "hello ${NAME},welcome!"
else
echo "what 's you say?"
fi
输出
[root@iZdpqkd3lvx9ncZ ~]# ./hello.sh
please input yuor name:ROOT
hello ROOT,welcome!
