Posts by ServerOk

Install Preview Generator in Nextcloud

Nextcloud apps

To enable preview for files in nextcloud, you need to install “Preview Generator” from next cloud app store To install login to nextcloud as admin. From right drop down menu, click + Apps link. Once on Apps page, you can use the search button on right side to search for “Preview Generator” and install […]

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Enable SEO url in nextcloud

To enable SEO url in next cloud, first make sure your web server have mod_rewrite module enabled. Edit config.php file

add following

overwrite.cli.url may already there, in that case, don’t add it again. Now run

See NextCloud […]

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csf error path to iptables is either not set or incorrect

Whem install csf firewall on Ubuntu 20.04, i get following error

This is because path for iptables is changed in Ubuntu 20.04. To fix the error edit csf.conf


Replace with

Now restart csf with csf -r, it will work.

See csf […]

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View SSL certficate Details

To view certificate details

For web server


POP3 via SSL



See SSL […]

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Disable systemd-resolved on Ubuntu/Deb/CentOS

systemd-resolved provide DNS resolver facility in newer version of Linux servers running systemd. I prefer manually editing /etc/resolv.conf and add resolvers. If you are running your own DNS server, then you need to disable systemd-resolved as it listen on port 53, with out disabling the service, you can’t start your DNS server. To disable systemd-resolved, […]

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