CE作业（2）
一、配置ntp时间服务器，确保客户端主机能和服务主机同步时间
配置时间服务器
服务器端 IP192.168.5.128
客户端 IP 192.168.5.129
首先保证时区一致
[root@server ~]# timedatectl
systemctl stop firewalld
setenforce 0
1.安装软件包
[root@localhost ~]# yum install chrony -y
2.服务器配置
[root@server~]# vim /etc/chrony.conf
修改如下内容
#pool 2.rhel.pool.ntp.org iburst
allow 192.168.5.0/24
local stratum 10
[root@server ~]# systemctl restart chronyd
3.客户端配置
[root@localhost ~]# vim /etc/chrony.conf
修改如下内容
pool 192.168.5.129 iburst
[root@localhost ~]# systemctl restart chronyd
测试
当前时间
[root@sever ~]# date
Sat Aug 27 19:22:49 CST 2022
[root@localhost ~]# date
Sat Aug 27 19:22:56 CST 2022
[root@sever ~]# date 111110102022.20
Fri Nov 11 10:10:20 CST 2022
[root@sever ~]# systemctl restart chronyd
[root@localhost ~]# date
2、配置ssh免密登陆，能够通过客户端主机通过redhat用户和服务端主机基于公钥验证方式进行远程连接
[root@456 ~]# hostname host
[root@456 ~]# bash \\\\更改名称
[root@host ~]# su redhat \\\\登陆普通用户redhat
[redhat@host root]$ ssh-keygen -t rsa \\\\在客户端主机下创建密钥对
Generating public/private rsa key pair.
Enter file in which to save the key (/home/redhat/.ssh/id_rsa):
/home/redhat/.ssh/id_rsa already exists.
Overwrite (y/n)? y
Enter passphrase (empty for no passphrase):
Enter same passphrase again:
Your identification has been saved in /home/redhat/.ssh/id_rsa.
Your public key has been saved in /home/redhat/.ssh/id_rsa.pub.
The key fingerprint is:
SHA256:BdGX5lOjocQVDaAKc5MvT9aKE4gpmpE90QQ4fq1m9HM redhat@host
The key's randomart image is:
+---[RSA 3072]----+
| .... o+.o+= |
|o o . o+ = + |
|... = + ...= + . |
| + * * + o. + |
|+ B + + S . . |
|.+ = o E . |
|o o = o |
| . |
| |
+----[SHA256]-----+
之后将此密钥对中的公钥发送至服务端
[redhat@host root]$ ssh-copy-id -i /home/redhat/.ssh/id_rsa.pub root@192.168.5.132
/usr/bin/ssh-copy-id: INFO: Source of key(s) to be installed: "/home/redhat/.ssh/id_rsa.pub"
The authenticity of host '192.168.5.132 (192.168.5.132)' can't be established.
ECDSA key fingerprint is SHA256:T7/sEALD9Zt772x20p8C6TgbsH+/J4RjD5lDASQ/aVE.
Are you sure you want to continue connecting (yes/no/[fingerprint])? yes
/usr/bin/ssh-copy-id: INFO: attempting to log in with the new key(s), to filter out any that are already installed
/usr/bin/ssh-copy-id: INFO: 1 key(s) remain to be installed -- if you are prompted now it is to install the new keys
password:
Number of key(s) added: 1
Now try logging into the machine, with: "ssh 'root@192.168.5.132'"
and check to make sure that only the key(s) you wanted were added.
在服务端的/root/.ssh/目录下查看是否接收到此公钥
[root@sever ~]# cd .ssh/
[root@sever .ssh]# ll
total 4
-rw-------. 1 root root 565 Aug 28 07:20 authorized_keys
尝试基于公钥的远程免密码登录
[redhat@qxx ]$ ssh redhat@192.168.5.132
Activate the web console with: systemctl enable --now cockpit.socket
This system is not registered to Red Hat Insights. See https://cloud.redhat.com/
To register this system, run: insights-client --register
Last failed login: Sun Apr 16 07:20:22 PDT 2023 from 192.168.5.100 on ssh:notty
There was 1 failed login attempt since the last successful login.
Last login: Sun Apr 16 07:14:11 2023 from 192.168.5.200
[redhat@sever ~]#
