Has anyone successfully installed and configured SMOKEPING On CentOS 6?
I would have thought that such a useful utility would more howto's, but I guess only the uber sysadmins use it, and they don't need no stinking howto.
The smokeping documentation could be written in Latin for as much help as it is.
It's in the Fedora default repo's - but between no more chkconfig/service and absolutely ZERO instructions on how to make it work I was unable to get it to run after it did successfully install (along with all it's dependents).
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Aug 31, 2020 Back to CentOS 7 booting issue. It seems the booting issue was fixed in the latest CentOS kernel versions. If the XenServer was up-to-date with the hotfixes then the VM’s should not have any problem. But in my case I didn’t update my XenServer, so now I’ve to either install the latest CentOS 7 kernel or downgrade to older previous running. Sep 09, 2018 This tutorial explains how to install Tobias Oetiker’s Smokeping into /opt/smokeping on a CentOS 7 box. Features of Smokeping: – Best of breed latency visualisation. A detail step by step guide on how to install and configure smokeping on centos 6. Has anyone successfully installed and configured SMOKEPING On CentOS 6?
How to Install and Config SmokePing on Ubuntu Server 16.04. How to Install and Config SmokePing on Ubuntu Server 16.04. In this tutorial, you will learn how to install CentOS 7 in a few easy steps. Read Also: How to Install CentOS 8 (Step by Step with Screenshots) Step 1: Download The ISO Image. To get a copy of CentOS 7 download from its source mirror. CentOS 7 is now shipping for 64 bit platforms, and currently there is no 32 bit ISO image.
All the howto's I've been able to find are woefully out of date (by years) using older distros and older versions of Smokeping.I would have thought that such a useful utility would more howto's, but I guess only the uber sysadmins use it, and they don't need no stinking howto.
The smokeping documentation could be written in Latin for as much help as it is.
It's in the Fedora default repo's - but between no more chkconfig/service and absolutely ZERO instructions on how to make it work I was unable to get it to run after it did successfully install (along with all it's dependents).
After I update my CentOS 7 VM kernel, the new kernel stopped booting on my XenServer hypervisor. I’ve been using XenServer version 7.1
Working Kernel version, before
And, after
yum update
was 3.10.0-693
And, after
yum update
Kernel version is 3.10.0-1127.19.1
This issue is due to the kernel which I updated has the
spectre/meltdown
patches in. But our XenServer 7 doesn’t. This difference created the kernel booting problem. Interestingly, this issue only affects CentOS VMs. My other Ubuntu servers can just run updates without issue but CentOS VM’s require the host to be updated or they stop working.To FIX this issue you should update your XenServer to the latest version or else if there are hotfixes available then you should install it.
Reverse gamertag lookup youtube. Vz24 mauser serial numbers. Link for XenServer 7.1 hotfixes. https://support.citrix.com/article/CTX230788
To upgrade XenServer 7.1 you should have Citrix License first. But a “free” patch was released for 7.2, due to the massive security issue later.
But if you have been running older XenServer’s version, older than 7.1 then you don’t have any choice besides updating XenServer to the latest.
Also, CentOS fixed their booting problem on their new Kernel versions which I will discuss later below.
What is Meltdown and Spectre vulnerabilities?
Someone having access to the VM will be able to read the memory outside the VM itself, and therefore read data from other VMs on this same physical host. An attacker could enter via other application exploits (webserver etc.) on your VMs.
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Am I affected?
Meltdown is using a design flaw into Intel CPUs only. This is called by Xen sec team ”SP3” (aka rogue data cache load).
You are impacted only if you are using:
You are impacted only if you are using:
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- 64-bits PV type VM (HVM/PVHVM aren’t affected!)
- Intel CPUs (AMD chip design is a bit different and not affected)
- untrusted VMs, ie untrusted users having VM access (even non-root!)
- All XenServer versions are affected
64-bits PV guests are vulnerable because guest and hypervisor share the same address space, but with different privileges. HVM aren’t.
Mitigate Risk:
Migrate all VM’s from
But if you have been running older version XenServer, older than
PV
to HVM
or upgrade XenServer to latest or install hotfixes if available. But if you have been running older version XenServer, older than
7.1
then you have to update your XenServer to resolve this issue.Back to CentOS 7 booting issue.It seems the booting issue was fixed in the latest CentOS kernel versions. If the XenServer was up-to-date with the hotfixes then the VM’s should not have any problem. But in my case I didn’t update my XenServer, so now I’ve to either install the latest CentOS 7 kernel or downgrade to older previous running one.
Upgrading Kernel Version
Add
ELRepo Repository
first.Add ELRepo gpg key to the system.
This is important – CentOS will not allow the installation of an unsigned software package. The GPG key provides a digital signature to verify that the software is authentic.
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Now add new ELRepo repository.
When it’s complete, check all repository enabled on the system, and make sure ELRepo is on the list.
kernel-ml – which indicates a mainline release, with a shorter support term but with more frequent updates.
OR INSTALL (Install either ml or lt)
kernel-lt – signifying a stable long-term support release.
listout all your existing kernel version on your system.
We have sucessfully installed CentOS latest kernel version
4.4.234-1
. Now set this as a default kernel.Set Default Kernel Version
First listout all existing kernel versions.
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Ted williams shotgun serial numbers. NOTE: The first entry is denoted as
Zero
. Let us modify the Kernel Version to 4.4.234-1
which is at line number 1
but denoted as entry 0
.Set default kernel.
Next,
Rebuild grub.cfg
file with 'gurb2-mkconfig'
command.Reboot Server
Above solution will resolves the booting issue.
If you don’t want to update CentOS kernel to latest one and want to boot from the existing previous working kernel then reboot your system and choose kernel version which was working fine before from
grub menu
and select enter
and follow the below steps.Centos 7 Install Nginx
Set Default Kernel Version but first list-out all existing kernel versions.
NOTE: The first entry is denoted as
Zero
. So currently the Server is booted to 0th
entry as per the above command output. Let us modify the Kernel Version to 3.10.0-693
which is at line number 4
but denoted as entry 3
.Set default kernel.
Next,
Rebuild grub.cfg
file with 'gurb2-mkconfig'
command.Check default Kernel Version
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Reboot Server