Red Hat RHCSA and RHCE certification exercise and operation steps

The level is limited and the problem is in a hurry. Please forgive me for any mistakes or omissions. In addition to CHSCA: 1. Change the password at startup Esce [in 1 mode] enterb [boot] setenforce0 {Change Password in tolerant mode} passwdreboot2.serviceNetworkManagerstop; chkconfigNetworkManageroff

The level is limited and the problem is in a hurry. Please forgive me for any mistakes or omissions.

CHSCA

Question:

1. Change the password at startup

Esc

E

[Enter 1 mode] enter

B [boot]

Setenforce 0 {Change Password in tolerant mode}

Passwd

Reboot

2. service NetworkManager stop; chkconfig NetworkManager off

3. service iptables stop; chkconfig iptables off

 

# Network settings

Hostname: station.domainX0.example.com

IP: 192.168.0.X

NETMASK: 255.255.255.0

GATEWAY: 192.168.0.254

 

1 'vim/etc/sysconfig/network

2 'vim/etc/sysconfig/network-scripts/ifcfg-eth0

3 'vim/etc/resolv. conf [DNS]

4 'vim/etc/hosts

# Configure yum Source

Specify to ftp: // 192.168.0.254/pub/rhel6/dvd/Server

1 'CD/etc/yum. repos. d/if there are other, mv dvd. repo gls. repo ../

2 'vim exam. repo [edit yum source]

[Server]

Name = Server

Baseurl = ftp: // 192.168.0.254/pub/rhel6/dvd/Server

Enable = 1

Gpgcheck = 0

3 'yum list {yum clean all clear cache}

# Lvm resizing

Will "/home lv" extend to 300 M (no more than 30 M error)

 

1 'lvdisplay

2 'lvextend-L 300 M/dev/vol0/home [target path to be resized]

3 'resize2fs/dev/vol0/home

4 'lvdisplay

# Lvm reduce to 200 M

1 'lvdisplay

2 'umount/home

3 'fsck-f/dev/vol0/home

4 'resize2fs/dev/vol0/home 200 M

5 'lvreduce-L 200 M/home/vol0/home

6 'mount/home

# Group Management

Add a group named "admin"

 

1 'groupadd-g 2000 admin

2 'grep admin/etc/group

 

# User management

Add user "tom", ask its home directory is/home/tommy

Add user "mike", ask its uid is 800, its affiliated groups is "admin"

Add user "selina", can't land shell

Passwd: RedHat

1 'useradd-d/home/tommy tom

2 'useradd-u 800-G admin mike usermod-aG admin add new group

3 'useradd-s/sbin/nologin selina

4' for UNAME in tom mike

> Do

> Echo "redhat" | passwd -- stdin $ UNAME

> Done

 

# File Permission

Copy file/etc/passwd to/var/tmp

Owners is root, group: admin, the members of admin can write in it

Others without any access

 

1 'cp/etc/passwd/var/tmp

2 'chgrp admin passwd & chown root: admin passwd

3 'chmod 660 passwd