96 results for tags
tech x
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networking - Citrix receiver 13.10 on Ubuntu 18.04.1 - Ask Ubuntu
citrix icaThu Jun 17 11:20:10 2021 - permalink -
$ cd /opt/Citrix/ICAClient/keystore/
$ sudo rm -r cacerts
$ sudo ln -s /etc/ssl/certs cacerts- https://askubuntu.com/questions/1064452/citrix-receiver-13-10-on-ubuntu-18-04-1/1069929#1069929
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Ubuntu 16.04 and ISPConfig 3.1 - stopping ClamAV
lamAV requires quite a bit of resources to run in the background and this usually slows down the mail delivery. In the ISPConfig 3 (Under Perfect Server setup), clamAV is run within Amavis. Therefore, typical removal of clamAV commands will not remove it.Thu Apr 22 23:17:49 2021 - permalink -
When RAM is really low, Linux kills amavis and this will cause mail not being delivered. Therefore, if we run amavis to manage anti-virus and spam, consider a minimum of 2G or 4G RAM VM/Cloud servers.
The steps to disable clamav and amavisd are:
(1) edit postfix conf - note amavis uses a special port 10024 and 10026. Therefore, if you are not using these ports, consider closing them in your firewall settings.
nano /etc/postfix/main.cf
# content_filter = amavis:[127.0.0.1]:10024
# receive_override_options = no_address_mappings
(2) Under ISPConfig 3.1, comment additional 2 lines
nano /etc/postfix/tag_as_foreign.re
#/^/ FILTER amavis:[127.0.0.1]:10024
nano /etc/postfix/tag_as_originating.re
#/^/ FILTER amavis:[127.0.0.1]:10026
Save changes and restart postfix
/etc/init.d/postfix restart
(3) stop and disable the services
/etc/init.d/clamav-daemon stop
/etc/init.d/clamav-freshclam stop
/etc/init.d/amavis stop
update-rc.d -f clamav-daemon remove
update-rc.d -f clamav-freshclam remove
update-rc.d -f amavis remove
To restore the changes, do:
update-rc.d clamav-daemon defaults
update-rc.d clamav-freshclam defaults
update-rc.d amavis defaults
The services shall start in the next reboot
(4) Under Ubuntu 16.04 and ISPConfig 3.1, also execute the following commands:
systemctl disable clamav-daemon.socket
systemctl disable clamav-daemon.service
systemctl disable clamav-freshclam.service
Note - The changes in postfix main.cf will get overwitten by an ispconfig software update when you select to "re-configure" services during update, so you should comment out the lines again after you install a ispconfig update.- https://kentechnote.blogspot.com/2017/01/ubuntu-1604-and-ispconfig-31-stopping.html
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swap
What is swappiness and how do I change it?Fri Mar 12 21:58:17 2021 - permalink -
The swappiness parameter controls the tendency of the kernel to move processes out of physical memory and onto the swap disk. Because disks are much slower than RAM, this can lead to slower response times for system and applications if processes are too aggressively moved out of memory.
swappiness can have a value of between 0 and 100
swappiness=0 tells the kernel to avoid swapping processes out of physical memory for as long as possible. For Kernel version 3.5 and newer it disables swapiness.
swappiness=100 tells the kernel to aggressively swap processes out of physical memory and move them to swap cache
The default setting in Ubuntu is swappiness=60. Reducing the default value of swappiness will probably improve overall performance for a typical Ubuntu desktop installation. A value of swappiness=10 is recommended, but feel free to experiment. Note: Ubuntu server installations have different performance requirements to desktop systems, and the default value of 60 is likely more suitable.
To check the swappiness value
cat /proc/sys/vm/swappiness
To change the swappiness value A temporary change (lost on reboot) with a swappiness value of 10 can be made with
sudo sysctl vm.swappiness=10
To make a change permanent, edit the configuration file with your favorite editor:
gksudo gedit /etc/sysctl.conf
Search for vm.swappiness and change its value as desired. If vm.swappiness does not exist, add it to the end of the file like so:
vm.swappiness=10
Save the file and reboot.- https://odea.fr/?Yommuw
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xmonadThu Oct 15 10:57:12 2020 - permalink -
qtile- https://camo.githubusercontent.com/baa7aec8232ea7253923108c3046ca5513c6d79b/68747470733a2f2f6769746c61622e636f6d2f647774312f646f7466696c65732f7261772f6d61737465722f2e73637265656e73686f74732f646f7466696c657330362e706e67
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Disable and remove ClamAV | Howtoforge - Linux Howtos and Tutorials
edit /etc/amavis/conf.d/50-userFri Jul 3 22:09:50 2020 - permalink -
Comment out the following two lines:
Code:
@bypass_virus_checks_maps = (
\%bypass_virus_checks, \@bypass_virus_checks_acl, \$bypass_virus_checks_re);
Looks like this:
Code:
#@bypass_virus_checks_maps = (
# \%bypass_virus_checks, \@bypass_virus_checks_acl, \$bypass_virus_checks_re);
@bypass_spam_checks_maps = (
\%bypass_spam_checks, \@bypass_spam_checks_acl, \$bypass_spam_checks_re);
Restart amavis:
/etc/init.d/amavis restart
Stop clamav:
/etc/init.d/clamav-daemon stop
/etc/init.d/clamav-freshclam stop
Disable clamav from running on system boot:
update-rc.d -f clamav-daemon remove
update-rc.d -f clamav-freshclam remove- https://www.howtoforge.com/community/threads/disable-and-remove-clamav.44443/
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Note: move ispconfig
prepare the new server, make a new installation of the very same version of ISPConfig you have on the origin server;Tue Jun 30 21:35:20 2020 - permalink -
make sure you have the same php packages installed on the new server. You can generate a list on the origin server with
dpkg --get-selections | grep ^php | awk '{print $1}' | xargs
and paste the output to apt install on the destination;
make a backup of the ispconfig database on origin. If you want you can change the IP (and eventually the hostname) with sed:
sed -i 's/1\.2\.3\.4/5\.6\.7\.8/g' db-dbispconfig-2019-05-25.sql
sed -i 's/old\.host\.name/new\.host\.name/g' db-dbispconfig-2019-05-25.sql
And restore it on the destination with:
cat db-dbispconfig-2019-05-25.sql | mysql -u root -p dbispconfig
connect to the new server ispconfig panel and go to Tools > Resync, check the All services checkbox and press Start;
rsync /var/www with:
rsync -a --stats --progress --delete ORIGIN_SERVER:/var/www/* /var/www/
rsync /var/vmail by adjusting the command above
rsync /etc/letsencrypt
rsync -a --stats --progress --delete ORIGIN_SERVER:/etc/letsencrypt/* /etc/letsencrypt/
make a dump of all c* databases and restore them on the new server;
if you want to retain the same ISPConfig panel certs copy /usr/local/ispconfig/interface/ssl/;
move DNS and all related stuff to the new IP.- https://odea.fr/?t5G_xA