linux exercise 8

1.客户端连接方式 ssh 远程主机用户@远程主机ip [root@desktop0 ~]# ssh root@172.25.0.11 The authenticity of host '172.25.0.11 (172.25.0.11)' can't be established. ECDSA key fingerprint is eb:24:0e:07:96:26:b1:04:c2:37:0c:78:2d:bc:b0:08. Are you sure you want to continue connecting (yes/no)? yes ##连接陌生主机时需要建立认证关系 Warning: Permanently added '172.25.0.11' (ECDSA) to the list of known hosts. root@172.25.0.11's password: ##远程用户密码 Last login: Mon Oct  3 03:13:47 2016 [root@server0 ~]# ##登陆成功

远程主机用户@远程主机ip -X ##调用远程主机图形工具

远程主机用户@远程主机ip command ##直接在远程主机运行某条命令

2.sshkey加密####.生成公钥私钥 [root@server0 ~]# ssh-keygen ##生成公钥私钥工具 Generating public/private rsa key pair. Enter file in which to save the key (/root/.ssh/id_rsa):[enter] ##加密字符保存文件（建议用默认） Created directory '/root/.ssh'. Enter passphrase (empty for no passphrase): [enter] ##密钥密码，必须>4个字符 Enter same passphrase again: [enter] ##确认密码 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: ab:3c:73:2e:c8:0b:75:c8:39:3a:46:a2:22:34:84:81 root@server0.example.com The key's randomart image is: +--[ RSA 2048]----+ |o                | |E.               | |..               | |.  . o           | |.o. * . S        | |oo.o o   .       | |+ =. .  .        | |o. oo.+..        | |    ..o*.        | +-----------------+ [root@server0 ~]# ls /root/.ssh/ id_rsa  id_rsa.pub id_rsa ##私钥，就是钥匙 id_rsa.pub ##公钥，就是锁 3.添加key认证方式 [root@server0 ~]# ssh-copy-id -i /root/.ssh/id_rsa.pub  root@172.25.0.11 ssh-copy-id ##添加key认证方式的工具 -i ##指定加密key文件 /root/.ssh/id_rsa.pub ##加密key root ##加密用户为root 172.25.0.11 ##被加密主机ip

4.日志管理服务rsyslog#### 1.rsyslog负责采集日志和分类存放日志 2.rsyslog日志分类 vim /etc/rsyslog.conf