Today I successfully upgraded my FreeBSD home nas server from 10.3 to 11.0. This is the final release of version 11.0, though the official announcement is expected to be made on September 28. After the system upgrade, I need to also upgrade the 2 zpools (tank and zroot) so they can have new features. Upgrading tank was easy, all I needed to do was running this command: # zpool upgrade tank This system supports ZFS pool feature flags. Enabled the following features on 'tank': sha512 skein For zroot, in addition to running the above command (by replacing the actually zpool name to zroot), I also need to update the boot code. ...

Yesterday I installed spamassassin package on a server running RHEL 6.8. Then this morning, I received an email alert with the following message: Subroutine IO::Socket::INET6::sockaddr_in6 redefined at /usr/share/perl5/Exporter.pm line 67. at /usr/share/perl5/IO/Socket/INET6.pm line 21. Subroutine IO::Socket::INET6::sockaddr_in6 redefined at /usr/share/perl5/Exporter.pm line 67. at /usr/share/perl5/IO/Socket/INET6.pm line 21. Subroutine IO::Socket::INET6::sockaddr_in6 redefined at /usr/share/perl5/Exporter.pm line 67. at /usr/share/perl5/IO/Socket/INET6.pm line 21. Subroutine IO::Socket::INET6::sockaddr_in6 redefined at /usr/share/perl5/Exporter.pm line 67. at /usr/share/perl5/IO/Socket/INET6.pm line 21. This seems to be a bug exists in an old version of IO::Socket::INET6. Upgrading this package should fix the problem: ...

While looking at the log produced by Request Tracker (RT) 4.2.12, I noticed there was a warning message about using “localtime” without parentheses. Here’s the actual error message: [warning]: Warning: Use of "localtime" without parentheses is ambiguous at /opt/rt4/sbin/../lib/RT/Interface/Email.pm line 526. The solution which I found from here, fixed the problem: On line 526 of file /opt/rt4/sbin/../lib/RT/Interface/Email.pm, replace: localtime with localtime(). Thanks to the chap who posted the solution.

I use ZFS as a storage driver for docker engine running on my machine. Today after my machine rebooted from a crash, yes Linux system crashes too, I notice that all my docker images and containers disappeared. ~ ❯❯❯ docker ps CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES ~ ❯❯❯ docker ps -a CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES First thing came to my mind was “did I accidentally destroy docker zfs data set last night?” ...

Sometimes in life, greater is not always better. Here’s a config which I used to make the Gnome 3 title bar smaller. Create a file in ~/.config/gtk-3.0/gtk.css: headerbar.default-decoration { padding-top: 3px; padding-bottom: 3px; min-height: 0px; font-size: 0.7em; } headerbar.default-decoration button.titlebutton { padding: 0px; min-height: 0px; } Here’s how the title bar looks like before and after applying the custom css file: ...