Tag: centos 6

CENTOS 6 : YUM ERROR : ALL MIRROR URLS ARE NOT USING FTP, HTTP[S] OR FILE

If you are still using CentOS 6, and trying to update the system using the following command:

yum update -y

You probably end up with the following:

Loaded plugins: fastestmirror, refresh-packagekit, security
Setting up Update Process
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
Error: Cannot find a valid baseurl for repo: base

The error is coming up because CentOS 6 has now hit the end of life, and the URLs are moved to centos vault. Now to update the CentOS, you would need to replace the URLs.

How to Fix

To fix the error, you need to replace your CentOS-base.repo file. Open up the following file using nano:

nano /etc/yum.repos.d/CentOS-Base.repo

Now, replace the full code using the following:

[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=https://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://mirror.centos.org/centos/$releasever/updates/$basearch/
baseurl=https://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://mirror.centos.org/centos/$releasever/extras/$basearch/
baseurl=https://vault.centos.org/6.10/extras/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6

Notice, how we replaced mirror.centos.org to valut.centos.org in the repo file.

Now, clean the yum, and update

yum clean all
yum update -y

You should be good to go now.

How to: Change Timezone in CentOS / RHEL 6 & CentOS / RHEL 7

How to change Timezone in CentOS 6 / RHEL 6

In CentOS 6, timezone files are located under /usr/share/zoneinfo. So, if your zone is for example, America/Chicago (UTC -6), it would be /usr/share/zoneinfo/America/Chicago and so on.

CentOS 6, uses a file called ‘localtime’ located under /etc to determine it’s currently set timezone.

# ls -la /etc/localtime

This file, is either the actual time zone file moved to this location or a symlink to the timezone under zoneinfo directory. So if you want to change the timezone, first you need to determine which timezone to use and then symlink it to localtime. You can do that using the following:

# rm -f /etc/localtime
# ln -s /usr/share/zoneinfo/Asia/Dhaka /etc/localtime
# date

This would set the current timezone to GMT +6 BDT or Asia/Dhaka timezone, zone I belong to.

How to change timezone in CentOS 7 or RHEL 7

CentOS 7, comes with a tool called ‘timedatectl’. This can be used to find and set the symlink for you instead of doing the work that were required in CentOS 6.

To list available time zones, run:

# timedatectl list-timezones

You can find your desired timezone, as following:

# timedatectl list-timezones | grep Chicago

Now, to set a time zone, use the command set-timezone with timedatectl command. For example, if I want to set the time zone to America/Chicago, I would run the following:

# timedatectl set-timezone America/Chicago
# date

This also should create the symlink of locatime file to the zoneinfo directory. You can see that with the following:

# ls -l /etc/localtime