Server Still Unstable

    The host machine which houses the mail spool, mail server virtual machine, and debian virtual machine, spontaneously booted today even though temperatures are correct.  So I am going to take it down around midnight tonight to run some diagnostics and make some adjustments.

 

Mail Server Maintenance Completed

     The BIOS had corrupted the Q-fan profiles and turned one chassis fan off entirely, put the others in a mode where they were just barely running so the machine was overheated.  A BIOS upgraded fixed the fan issues.

     While I was there and letting a torture test run for a while (8 copies of an AVX version of prime95 running small fft’s, about the most torturous thing you can throw at a modern CPU, I worked on some other issues and discovered the problem with postfix not starting on debian, missing postfix and postdrop groups and postfix user.  I’ve fixed this problem before but it turns out the post.install script of the postfix package distributed with stretch (and Ubuntu 16.04.3 LTS) is broken.  So it will likely break again the next time a postfix update is kicked out.

Mail Server Maintenance

     I need to take the server that holds the mail spool down a few times briefly tonight to make some BIOS adjustments.  I believe I’ve got the CPU voltage just a touch too low and it is slightly unstable.  This may take several reboots and benchmarks to find the correct level.  It is presently unstable and has rebooted spontaneously twice in the last couple of days.  This is symptomatic of CPU voltage too low for the clock rate and I did adjust it down as low as I could get it to run, what I thought was stable, the last time I worked on it, so I’m going to crank it up slightly.

Mint 18.2 Sonya Operational

     Our shell server mint.eskimo.com has been upgraded to Sonya 18.2.  Initially I had some problems getting postfix working, chased it down to sendmail already being installed and not automatically deinstalled when postfix was installed, as it normally is on other debian derivatives.

     Also had issues with idmapd not working initially, this turned out to be an old issue with nsswitch.conf, compat does not work as advertised, it is necessary instead to specify nis files, which gives the behavior compat is supposed to but does not.

Kernel Upgrades Completed

     The kernel upgrades are completed.  All host machines rebooted properly.  The longest took 3 minutes.  However, the web server did not properly NFS mount the /home directory after rebooting so some websites were unavailable for about 1/2 hour until I discovered and corrected this.

Brief Service Interruption Kernel Upgrades

     I need to reboot the host machines which will cause a brief interruption in all services lasting 5-10 minutes if all goes well.  If all does not go well and I need to drive to the co-location facility, it could be as long as an hour but I have not had any failure to boots since the upgrade to Ubuntu 17.10 so I do not expect difficulties.

Mint – Down for Upgrade

     I am taking the Linux Mint shell server, mint.eskimo.com, down for an upgrade from Serena 18.1 to Sonya 18.2.  Serena has been particularly problematic with NIS always failing to bind because the ordering of applications starting is not right in systemd, in particular systemd does not wait for portmap to start before trying to start ypbind.  Early versions of Ubuntu with systemd had similar issues, I am hoping 18.2 will resolve this.

     Because Mint online upgrades generally do not work well, particularly when third party repositories are concerned, and because there has been a change of hardware architecture from an i7-2600 to an i7-6850k which supports some additional instructions, I am doing a fresh install which will require recompiling some third party apps.  So it will likely be down most of this evening.

     Please consider using debian or ubuntu as alternatives, like Mint they are debian or debian derived but generally work better.  Hopefully Sonya will function better.

Libre Office Suite

    I have installed Libre Office Suite on all shell servers except “eskimo.com” which hasn’t had any new software available in two decades.  On those machines on which it is already present, I installed missing elements so that it is complete.

     I’ve also installed codeblocks, an Integrated Development Environment suitable for C development.  I’m a command line person myself but if an IDE is your preference, this is now available to you on all shell servers except “eskimo.com”.

 

OpenSuse updated to Leap 42.3

     OpenSuse.eskimo.com has been upgraded to leap 42.3.  An attempt at an online upgrade failed, it did everything except apparently write the boot block correctly because upon rebooting it could not even start grub.

     So I did a fresh install of 42.3, which is probably just as well as the upgrade from 42.1 to 42.2, while successful, was less than 100% clean.

     I am still installing applications so if there is anything particularly important, please create a ticket using https://www.eskimo.com/ and then the Support drop down menu, select “Tickets”.