How to Pass the RedHat EX200 Exam: Comprehensive Red Hat Certified System Administrator - RHCSA (8.2) Guide and Tips

# which echo

# crontab -e

23 14 * * * /bin/echo hello

# crontab -l (Verify)

[root@node1 ~]# vim /etc/yum.repos.d/redhat.repo

[BaseOS]

name=BaseOS

baseurl=http://utility.domain15.example.com/BaseOS

enabled=1

gpgcheck=1

gpgkey=http://utility.domain15.example.com/RPM-GPG-KEY-redhat-release

[AppStream]

name=AppStream

baseurl=http://utility.domain15.example.com/AppStream

enabled=1

gpgcheck=1

gpgkey=http://utility.domain15.example.com/RPM-GPG-KEY-redhat-release

[root@node1 ~]# yum clean all

[root@node1 ~]# yum repolist

repo id repo name

AppStream AppStream

BaseOS BaseOS

[root@node1 ~]# yum list all

useradd -u 3400 iar

passwd iar

# cat /etc/grub.conf

# cd /boot

# lftp it

# get dr/dom/kernel-xxxx.rpm

# rpm -ivh kernel-xxxx.rpm

# vim /etc/grub.conf

default=0

# useradd -u 1234 alex

# passwd alex

alex111

alex111

OR

echo alex111|passwd -stdin alex

*

[root@node1 ~]# cat /etc/passwd | grep nologin > /root/strings

[root@node1 ~]# cat /root/strings

bin:x:1:1:bin:/bin:/sbin/nologin

daemon:x:2:2:daemon:/sbin:/sbin/nologin

adm:x:3:4:adm:/var/adm:/sbin/nologin

lp:x:4:7:lp:/var/spool/lpd:/sbin/nologin

mail:x:8:12:mail:/var/spool/mail:/sbin/nologin

• ftp server.domain11.example.com Anonymous login

ftp> cd /pub/updates ftp> ls

ftp> mget kernel* ftp> bye

• rpm -ivh kernel*
• vim /etc/grub.conf

Check the updatted kernel is the first kernel and the orginal kernel remains available. set default=0

wq!

• vi /etc/httpd/conf.d/ssl.conf ServerName www.rhce.com DocumentRoot /var/www/rhce DirectoryIndex index.html index.htm ServerAdmin webmaster@rhce.com SSLEngine on SSLCertificateFile /etc/httpd/conf/ssl.crt/server.crt SSLCertificateKeyFile /etc/httpd/conf/ssl.key/server.key
• cd /etc/httpd/conf

3 make testcert

• Create the directory and index page on specified path. (Index page can download from ftp://server1.example.com at exam time)
• service httpd start|restart
• chkconfig httpd on

Apache can provide encrypted communications using SSL (Secure Socket Layer). To make use of encrypted communication, a client must request to https protocol, which is uses port 443. For HTTPS protocol required the certificate file and key file.

• rpm -ivh ftp://server1/example.com/pub/updates/zsh-*

or

• Login to ftp server : ftp ftp://server1.example.com using anonymous user.
• Change the directory: cd pub and cd updates
• Download the package: mget zsh-*
• Quit from the ftp prompt : bye
• Install the package
• rpm -ivh zsh-*
• Verify either package is installed or not : rpm -q zsh

# cd /root; wget ftp://192.168.0.254/pub/boot.iso

# mkdir -p /media/cdrom

# vim /etc/fstab

/root/boot.iso /media/cdrom iso9660 defaults,loop 0 0

# mount -a

mount [-t vfstype] [-o options] device dir