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--- linux:admin [2017/01/25 02:31] – [Dynamic route] admin
+++ linux:admin [2022/10/29 16:15] (current) – external edit 127.0.0.1
@@ Line 3: / Line 3: @@
 {{:linux:red_hat_linux_administration_-_a_beginner_s_guide_2003.pdf|}}
-===== install software =====
+===== Fix Old CentOS Repos =====
-==== install rpm package ====
+Maintainece update not supported from **2020/11/30** => you must config repos to new mirror for Fixing yum error:
+<code bash>
+yum list
+Failed to set locale, defaulting to C
+Loaded plugins: fastestmirror
+Determining fastest mirrors
+YumRepo Error: All mirror URLs are not using ftp, http[s] or file.
+ Eg. Invalid release/repo/arch combination/
+removing mirrorlist with no valid mirrors: /var/cache/yum/x86_64/6/base/mirrorlist.txt
+</code>
+Steps:
+  - Step1: **Update /etc/yum.repos.d/CentOS-Base.repo**
+<code bash>
+[base]
+name=CentOS-$releasever - Base
+#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=os&infra=$infra
+baseurl=http://vault.centos.org/6.10/os/$basearch/
+gpgcheck=1
+gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6
+#released updates [updates] name=CentOS-$releasever - Updates #mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=updates&infra=$infra baseurl=http://vault.centos.org/6.10/updates/$basearch/ gpgcheck=1 gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6
+#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://vault.centos.org/6.10/extras/$basearch/ gpgcheck=1 gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6
+#additional packages that extend functionality of existing packages [centosplus] name=CentOS-$releasever - Plus #mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=centosplus&infra=$infra baseurl=http://vault.centos.org/6.10/centosplus/$basearch/ gpgcheck=1 enabled=0 gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6
+#contrib - packages by Centos Users
+[contrib]
+name=CentOS-$releasever - Contrib
+#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=contrib&infra=$infra
+baseurl=http://vault.centos.org/6.10/contrib/$basearch/
+gpgcheck=1
+enabled=0
+gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6
+</code>
+  - Step2:<code bash>
+yum clean all
+</code>
+===== Install software =====
+==== Install rpm package ====
   mount /dev/cdrom /mnt/cdrom/
   cd /mnt/cdrom/CentOS
@@ Line 283: / Line 319: @@
 /etc/init.d/networking restart
 </code>
-==== Check netword card ====
+==== Check network card ====
 <code bash>
 /sbin/ifconfig -a
@@ Line 420: / Line 456: @@
 === crontab configuration file base on linux user ===
   * cat /var/spool/cron/root <code>
-*/30 * * * * /usr/sbin/ntpdate 118.102.5.136
+*/30 * * * * /usr/sbin/ntpdate  pool.ntp.org
 */5 * * * * /usr/local/bin/iostat.sh
 2 * * * /etc/webmin/cron/tempdelete.pl
@@ Line 457: / Line 493: @@
 ls /home/anhvc
 => 214501_170809.txt
+</code>
+=== Create contab to update date/time of system ===
+  - Step1: Install ntpdate<code bash>
+yum install ntpdate
+</code>
+  - Step2: Create contab content:<code bash>
+*/30 * * * * /usr/sbin/ntpdate  pool.ntp.org
 </code>
 ==== logrotate ====