New CentOS 7 Server Setup Commands - Revision history

Sfiggins: /* Post install configuration */

2025-03-20T22:53:49Z

Post install configuration

Sfiggins at 04:32, 12 August 2020

2020-08-12T04:32:47Z

Sfiggins: /* Remove Postfix, and add needed packages. */

2020-04-22T15:41:50Z

Remove Postfix, and add needed packages.

Sfiggins: /* Remove old kernel so system scans cleanly and update kernel tools */

2019-06-25T01:20:27Z

Remove old kernel so system scans cleanly and update kernel tools

Sfiggins: /* Remove old kernel so system scans cleanly */

2018-12-13T17:15:57Z

Remove old kernel so system scans cleanly

Sfiggins at 17:09, 13 December 2018

2018-12-13T17:09:43Z

Sfiggins: /* Disable selinux on the guest. */

2016-04-02T19:01:02Z

Disable selinux on the guest.

Sfiggins: Created page with "== Install From Image, with 'minimal install' option == == Post install configuration == === Remove Network Manager software ===

 # /bin/systemctl disable NetworkManag..."

2016-04-02T18:59:41Z

Created page with "== Install From Image, with 'minimal install' option == == Post install configuration == === Remove Network Manager software === <pre> # /bin/systemctl disable NetworkManag..."

New page

== Install From Image, with 'minimal install' option ==

== Post install configuration ==

=== Remove Network Manager software ===

<pre>
# /bin/systemctl disable NetworkManager
# /bin/systemctl disable NetworkManager-dispatcher
# yum erase NetworkManager-tui NetworkManager-glib NetworkManager
</pre>

=== Configure Network ===

Run the commands below to set up a static ip address (192.168.1.221) and hostname (test-centos-1).

<pre>
# export remote_hostname=guest1
# export remote_ip=192.168.1.221
# export remote_gateway=192.168.1.1

# hostnamectl set-hostname $remote_hostname

# sed -i.bak "s/.*BOOTPROTO=.*/BOOTPROTO=none/g" /etc/sysconfig/network-scripts/ifcfg-eth0

# cat << EOF >> /etc/sysconfig/network-scripts/ifcfg-eth0
IPADDR0=$remote_ip
PREFIX0=24
GATEWAY0=$remote_gateway
DNS1="216.136.95.2"
DNS2="64.132.94.250"
NM_CONTROLLED="no"
EOF

# systemctl restart network
# systemctl enable network.service
# systemctl enable sshd
# systemctl start sshd

# echo "checking connectivity"
# ping www.google.com
</pre>

=== Disable selinux on the guest. ===

<pre>
# setenforce 0
# # sed -i.bak "s/^SELINUX=.*/SELINUX=disabled/g" /etc/selinux/config
</pre>

=== Remove Postfix, and add needed packages. ===

<pre>
# yum -y erase postfix
# yum -y install finger nc net-snmp net-snmp-perl net-snmp-utils ntp perl-Date-Manip \
perl-DBD-SQLite sendmail sendmail-cf sssd tcp_wrappers tcpdump telnet tftp \
tog-pegasus traceroute vim-enhanced wget oddjob-mkhomedir net-tools
</pre>

=== Fix Time Zone ===

<pre>
# rm -f /etc/localtime
# ln -s /usr/share/zoneinfo/MST7MDT /etc/localtime
</pre>

=== Turn off rp_filter ===

<pre>
# echo "net.ipv4.conf.default.rp_filter = 0" > /etc/sysctl.d/rpfilter.conf
</pre>

← Older revision		Revision as of 22:53, 20 March 2025
Line 2:		Line 2:

	== Post install configuration ==		== Post install configuration ==
		+
		+	=== Update /etc/yum.repo.d/CentOS-Base.repo for archive support ===
		+
		+	<pre>
		+	# CentOS-Base.repo
		+	#
		+	# The mirror system uses the connecting IP address of the client and the
		+	# update status of each mirror to pick mirrors that are updated to and
		+	# geographically close to the client. You should use this for CentOS updates
		+	# unless you are manually picking other mirrors.
		+	#
		+	# If the mirrorlist= does not work for you, as a fall back you can try the
		+	# remarked out baseurl= line instead.
		+	#
		+	#
		+
		+	[base]
		+	name=CentOS-$releasever - Base
		+	#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=os&infra=$infra
		+	#baseurl=http://mirror.centos.org/centos/$releasever/os/$basearch/
		+	baseurl=http://vault.centos.org/7.9.2009/os/$basearch/
		+	gpgcheck=1
		+	gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
		+
		+	#released updates
		+	[updates]
		+	name=CentOS-$releasever - Updates
		+	#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=updates&infra=$infra
		+	#baseurl=http://mirror.centos.org/centos/$releasever/updates/$basearch/
		+	baseurl=http://vault.centos.org/7.9.2009/updates/$basearch/
		+	gpgcheck=1
		+	gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
		+
		+	#additional packages that may be useful
		+	[extras]
		+	name=CentOS-$releasever - Extras
		+	#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=extras&infra=$infra
		+	#baseurl=http://mirror.centos.org/centos/$releasever/extras/$basearch/
		+	baseurl=http://vault.centos.org/7.9.2009/extras/$basearch/
		+	gpgcheck=1
		+	gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
		+
		+	#additional packages that extend functionality of existing packages
		+	[centosplus]
		+	name=CentOS-$releasever - Plus
		+	#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=centosplus&infra=$infra
		+	#baseurl=http://mirror.centos.org/centos/$releasever/centosplus/$basearch/
		+	baseurl=http://vault.centos.org/7.9.2009/centosplus/$basearch/
		+	gpgcheck=1
		+	enabled=0
		+	gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
		+	</pre>

	=== Remove Network Manager software ===		=== Remove Network Manager software ===

@@ Line 55: / Line 55: @@
 # yum -y install finger nc net-snmp net-snmp-perl net-snmp-utils ntp perl-Date-Manip \
      perl-DBD-SQLite sendmail sendmail-cf sssd tcp_wrappers tcpdump telnet tftp \
-     tog-pegasus traceroute vim-enhanced wget oddjob-mkhomedir net-tools yum-cron
+     tog-pegasus traceroute vim-enhanced wget oddjob-mkhomedir net-tools yum-cron \
 </pre>
@@ Line 63: / Line 64: @@
 # yum -y install finger nc net-snmp net-snmp-perl net-snmp-utils ntp perl-Date-Manip \
      perl-DBD-SQLite sssd tcp_wrappers tcpdump telnet tftp tog-pegasus traceroute \
-     vim-enhanced wget oddjob-mkhomedir net-tools yum-cron
+     vim-enhanced wget oddjob-mkhomedir net-tools yum-cron  bind-utils
 </pre>

@@ Line 89: / Line 89: @@
 # yum -y erase kernel-<old kernel version>
 # yum -y update kernel-tools kernel-tools-libs
 </pre>

@@ Line 83: / Line 83: @@
 </pre>
-==Remove old kernel so system scans cleanly==
+==Remove old kernel so system scans cleanly and update kernel tools==
 <pre>
 # rpm -qa | grep kernel
 # yum -y erase kernel-<old kernel version>
 </pre>

@@ Line 69: / Line 69: @@
 <pre>
 # echo "net.ipv4.conf.default.rp_filter = 0" > /etc/sysctl.d/rpfilter.conf
 </pre>

@@ Line 42: / Line 42: @@
 </pre>
-=== Disable selinux on the guest. ===
+=== Disable selinux ===
 <pre>
 # setenforce 0
-# # sed -i.bak "s/^SELINUX=.*/SELINUX=disabled/g" /etc/selinux/config
+# sed -i.bak "s/^SELINUX=.*/SELINUX=disabled/g" /etc/selinux/config
 </pre>