cloud engineer
How to lock a package or software in RedHat.
# For RHEL 5 yum install yum-versionlock # For RHEL 6 and 7 yum install yum-plugin-versionlock # For RHEL 8 and 9 yum install python3-dnf-plugin-versionlock |
# For RHEL 5 yum install yum-versionlock # For RHEL 6 and 7 yum install yum-plugin-versionlock # For RHEL 8 and 9 yum install python3-dnf-plugin-versionlock
Locking a package
yum versionlock gcc-* |
yum versionlock gcc-*
List locked packages
yum versionlock list |
yum versionlock list
Here’s how to lockdown a package to a specific version.
Search for the current package.
$ sudo rpm -qa | grep sdk google-cloud-sdk-365.0.1-1.x86_64 |
$ sudo rpm -qa | grep sdk google-cloud-sdk-365.0.1-1.x86_64
Install versionlock.
yum install yum-plugin-versionlock |
yum install yum-plugin-versionlock
Lock a package.
yum versionlock google-cloud-sdk-365.0.1-1.x86_64 |
yum versionlock google-cloud-sdk-365.0.1-1.x86_64
Display all locked versions.
yum versionlock list |
yum versionlock list
Unlock and clear.
yum versionlock clear |
yum versionlock clear
Here’s the command to check if the system needs a reboot after running yum update.
Must be root or run it sudo.
$ needs-restarting -r ; echo $? Core libraries or services have been updated: openssl-libs -> 1:1.0.2k-21.el7_9 kernel -> 3.10.0-1160.31.1.el7 dbus -> 1:1.10.24-15.el7 linux-firmware -> 20200421-80.git78c0348.el7_9 glibc -> 2.17-324.el7_9 systemd -> 219-78.el7_9.3 Reboot is required to ensure that your system benefits from these updates. More information: https://access.redhat.com/solutions/27943 1 |
$ needs-restarting -r ; echo $? Core libraries or services have been updated: openssl-libs -> 1:1.0.2k-21.el7_9 kernel -> 3.10.0-1160.31.1.el7 dbus -> 1:1.10.24-15.el7 linux-firmware -> 20200421-80.git78c0348.el7_9 glibc -> 2.17-324.el7_9 systemd -> 219-78.el7_9.3 Reboot is required to ensure that your system benefits from these updates. More information: https://access.redhat.com/solutions/27943 1
In this instance, it requires a reboot due to a new kernel.
It’s recommended to set the clock to UTC. In rare occasions, local time may be needed.
Here’s how to set your server’s timezone permanently.
Check the date first.
date |
date
Backup localtime. Set it to US Eastern Time.
mv /etc/localtime /etc/localtime.backup ln -s /usr/share/zoneinfo/America/New_York /etc/localtime |
mv /etc/localtime /etc/localtime.backup ln -s /usr/share/zoneinfo/America/New_York /etc/localtime
Backup clock. Set it to US Eastern Time.
cp -p /etc/sysconfig/clock /etc/sysconfig/clock.backup > /etc/sysconfig/clock echo ZONE=\"America/New_York\" > /etc/sysconfig/clock |
cp -p /etc/sysconfig/clock /etc/sysconfig/clock.backup > /etc/sysconfig/clock echo ZONE=\"America/New_York\" > /etc/sysconfig/clock
Run the date again to validate.
date |
date
Here’s the installation instructions for OpenJDK 8.
For Fedora, Redhat and Oracle Linux.
yum install java-1.8.0-openjdk |
yum install java-1.8.0-openjdk
For Debian and Ubuntu.
apt-get install openjdk-8-jre |
apt-get install openjdk-8-jre
To see if the packages (symbolic links) are there, they can be found in /etc/alternatives/, at least in Redhat 7.
ls -l /etc/alternatives/ |
ls -l /etc/alternatives/