Linux Configuration

Networking(configure the static IP address.)

• Detailed info found here
• Navigate to /etc/sysonfig/network-scripts.
• Edit ifcfg-interfacename(this is ens192 in the centos VM). Change or add the following fields as specified.

BOOTPROTO=none

ONBOOT=yes

IPADDR=10.0.5.3(New address for linux box)

PREFIX=24(Subnet)

GATEWAY=10.0.5.2(ip of gateway FW)

DNS1=10.0.5.5(ip of DNS server)

DOMAIN=samuel.local(The domain name sent up earlier.)

• Restart network systemctl restart network
• Test connectivity. ping outside domain and hostnames in the network.

Adding a privileged user.

• add user useradd username
• change password passwd username
• add user to group usermod -g group username

Add Linux to DNS

• On ad go to DNS manager and add a new A or AAAA host to the local domain.

Remote access via SSH.

• ssh username@dhcp01-samuel
• Get root privileges with sudo, sudo su, sudo -i.
• sudo -i is best practice
• Command history can be seen with the history command

Important Linux Commands

• cp copy files
• mv move files
• less like cat but provides a scrolling interface.
• rm delete something.
• touch create empty files
• head -n n filename display a specified number lines at the top of a file.
• tail -n n filename display a specified number lines at the bottom of a file.
• chmod used to change file permissions