Upgrading kernel
This page reorganizes the operational steps for Upgrading kernel.
Upgrade Kernel
MiRTA PBX is used to run on CentOS 6, 7 and 9, 64bit.
Most modern servers have features that are working not optimal with the stock kernels. This is especially true for CentOS 6, having problems with large memory servers. To avoid these problems, it is possible to upgrade safely the servers to the latest stable Kernel 4.
Download the signature for repository Elrepo
rpm --import https://www.elrepo.org/RPM-GPG-KEY-elrepo.orgDownload the repo package:
For CentOS 6:
rpm -Uvh https://www.elrepo.org/elrepo-release-6-8.el6.elrepo.noarch.rpmFor CentOS 7:
rpm -Uvh https://www.elrepo.org/elrepo-release-7.0-3.el7.elrepo.noarch.rpmActivate the new repo "elrepo-kernel" and then install the kernel-lt and kernel-lt-devel
For CentOS 6, you need to edit the grub.conf and select the boot option for the new kernel
For CentOS 7, it is a bit tricky. First you need to identify the kernel menu entry:
Then edit the default menu entry and set the one identified above, like GRUB_DEFAULT=0
/etc/default/grub
Rebuild the grub configuration with
grub2-mkconfig -o /boot/grub2/grub.cfg
To temporarily try the kernel run the command
grub2-reboot <id>
Upgrading Kernel modules
If you are upgrading the kernel from 2.6 to 4.4, the GeoIP module requested is different. In this case, once the server restarts, the GeoIP module will fail to start and you may be locked out of your server. It can be a good idea to disable GeoIP support before performing the upgrade and then recompile the right module and then activate back GeoIP.
If you are moving from kernel 2.6 to 4.4, once running kernel 4.4 perform the following steps:
cd /usr/local/src
\rm -r xtables*
wget the PBX web address
tar xvf xtables-addons-2.10.tar.xz
cd xtables-addons-2.10
wget the PBX web address
mv mconfig_1.37 mconfig
./configure ; make ; make install
Dahdi module instead, is fully compatible between kernel versions
Updating Kernel modules
MiRTA PBX relies on two kernel modules, geoip and dahdi. The first allows to filter packets based on the geographical location, so you can avoid receiving call attempts from foreign countries, the second make conferences to work. When the kernel is upgraded, during a normal CentOS upgrade, these kernel modules will be not automatically regenerated for the new kernel. In this case, you need to reboot the server into new kernel and recompile both.
Recompiling dahdi
Dahdi installation directory is in /usr/local/src, so it will be enough to run:
<tt>
cd /usr/local/src/dahdi*
make
make install
service dahdi restart
</tt>
Latest CentOS 9 kernel can only run the latest dahdi from github
cd /usr/local/src/
git clone https://github.com/asterisk/dahdi-linux
cd dahdi-linux
make
make install
cd ..
cd /usr/local/src
git clone https://github.com/asterisk/dahdi-tools
cd dahdi-tools
autoreconf -i
./configure
make
make install
make config
/etc/init.d/dahdi restart
Recompiling geoip
GeoIP installation directory is in /usr/local/src, so it will be enough to run:
<tt>
cd /usr/local/src/xtables*
./configure
make
make install
</tt>
Problems with CentOS 9
The people at Redhat are doing an odd work, by merging changes from newer kernels into the 5.14.0 kernel used by CentOS 9 and derivatives. The result is dahdi is no longer able to compile successfully on some newer versions because the structure of the kernel source is changed, but the installation script still see it as 5.14.0.
For now these are the working tested kernels:
- 5.14.0-362
- 5.14.0-378
for now you can download the packages for 362 from
the PBX web address
Useful commands to list and change the default kernel:
grubby --info=ALL
grubby --set-default /boot/vmlinuz-5.14.0-362.18.1.el9_3.x86_64
Current Verification
After applying the change, verify the related MiRTA PBX page, the Asterisk logs, and the relevant Status menu entry. Recheck tenant selection before testing tenant-specific behavior.
No comments to display
No comments to display