Different kernels

[tesme33]

Hi
im having 2 efa running as a relay.
Both shown on "yum update" no updates. But they have different kernel versions.

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Linux efa4.xxx.xxx 3.10.0-1160.31.1.el7.x86_64 #1 SMP Thu Jun 10 13:32:12 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux
Linux efa8.xxx.xxx 3.10.0-1160.25.1.el7.x86_64 #1 SMP Wed Apr 28 21:49:45 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux


[ladmin@efa4 yum.repos.d]$ ls
CentOS-Base.repo       CentOS-Media.repo          eFa4.repo          ius-archive.repo
CentOS-CR.repo         CentOS-Sources.repo        elrepo.repo        ius.repo
CentOS-Debuginfo.repo  CentOS-Vault.repo          epel.repo          ius-testing.repo
CentOS-fasttrack.repo  CentOS-x86_64-kernel.repo  epel-testing.repo


[ladmin@efa8 yum.repos.d]$ ls
[ladmin@efa8 yum.repos.d]$ ls
CentOS-Base.repo       CentOS-fasttrack.repo  CentOS-Vault.repo          elrepo.repo        ius-archive.repo
CentOS-CR.repo         CentOS-Media.repo      CentOS-x86_64-kernel.repo  epel.repo          ius.repo
CentOS-Debuginfo.repo  CentOS-Sources.repo    eFa4.repo                  epel-testing.repo  ius-testing.repo

I dont see a difference in the repos.

Checking available kernels gives:

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[ladmin@efa8 yum.repos.d]$ yum --disablerepo="*" --enablerepo="elrepo-kernel" list available
Geladene Plugins: fastestmirror
Loading mirror speeds from cached hostfile
 * elrepo-kernel: ftp.nluug.nl
elrepo-kernel                                                                                            | 3.0 kB  00:00:00
elrepo-kernel/primary_db                                                                                 | 2.0 MB  00:00:00
Verfügbare Pakete
kernel-lt.x86_64                                                5.4.142-1.el7.elrepo                               elrepo-kernel
kernel-lt-devel.x86_64                                          5.4.142-1.el7.elrepo                               elrepo-kernel
kernel-lt-doc.noarch                                            5.4.142-1.el7.elrepo                               elrepo-kernel
kernel-lt-headers.x86_64                                        5.4.142-1.el7.elrepo                               elrepo-kernel
kernel-lt-tools.x86_64                                          5.4.142-1.el7.elrepo                               elrepo-kernel
kernel-lt-tools-libs.x86_64                                     5.4.142-1.el7.elrepo                               elrepo-kernel
kernel-lt-tools-libs-devel.x86_64                               5.4.142-1.el7.elrepo                               elrepo-kernel
kernel-ml.x86_64                                                5.13.12-1.el7.elrepo                               elrepo-kernel
kernel-ml-devel.x86_64                                          5.13.12-1.el7.elrepo                               elrepo-kernel
kernel-ml-doc.noarch                                            5.13.12-1.el7.elrepo                               elrepo-kernel
kernel-ml-headers.x86_64                                        5.13.12-1.el7.elrepo                               elrepo-kernel
kernel-ml-tools.x86_64                                          5.13.12-1.el7.elrepo                               elrepo-kernel
kernel-ml-tools-libs.x86_64                                     5.13.12-1.el7.elrepo                               elrepo-kernel
kernel-ml-tools-libs-devel.x86_64                               5.13.12-1.el7.elrepo                               elrepo-kernel
perf.x86_64                                                     5.13.12-1.el7.elrepo                               elrepo-kernel
python-perf.x86_64                                              5.13.12-1.el7.elrepo                               elrepo-kernel

Now the questions are.

- why do i have 2 different kernels ?
- is it save / advisable to switch to a newer kernel ?

[shawniverson]

Now the questions are.

- why do i have 2 different kernels ?
- is it save / advisable to switch to a newer kernel ?

This is normal on CentOS. Your active kernel is revealed with

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uname -r

CentOS likes to keep one or more previous kernels around so you can boot back into them, if necessary.

I don't have any knowledge of those kernels that you listed. I would advise not upgrading to them.

[tesme33]

Hi
shame on my head. I didnt check /boot for kernels laying around .
And there i found that both machines are waiting for a reboot to get the latest (and same on both machines) kernel loaded.

[ladmin@efa8 ~]$ uname -a
Linux efa8.xxx.xxx 3.10.0-1160.36.2.el7.x86_64 #1 SMP Wed Jul 21 11:57:15 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux

[ladmin@efa4 ~]$ uname -a
Linux efa4.xxx.xxx 3.10.0-1160.36.2.el7.x86_64 #1 SMP Wed Jul 21 11:57:15 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux

I would say efa is running to stable ......


Thx for pushing me in the right direction