Divided we stand.
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DKIM=temperror
Recently I have checked my messages headers of the mail that comes from the andreybondarenko.com MX and found that Google shows that my DKIM signature is invalid: In the spam score section: However the header itself is present: I have found that it’s quite common configuration error of the OpenDKIM, the selector you choose to store key can be chosen randomly, but the TXT record should match /etc/opendkim.conf.…
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Puppet vs Ansible vs Chef vs Salt
Good presentation, high level.
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Bash scripting manual
Apple has got very nice bash scripting manual here: https://developer.apple.com/library/content/documentation/OpenSource/Conceptual/ShellScripting/Introduction/Introduction.html Check the security and AWK sections.
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Let’s encrypt cert updates
Let’s encrypt is wonderful, but certificate are getting expired every 3 months. Since it’s a first time I need to renew them, I have done it manually. The tool authenticates you (by default) with special file created in the .well-know/acme-challenge directory of the root, so the blog engine should not interfere or rewrite anything and should not return it’s own 404 page. Historically my nginx.conf has lots of existing redirects and rules,…
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Moving iTunes Account to the other country
If you are changing the country you may need to change the location of your online services as well. May be if you are moving from US to EU it’s not that important, but if you are moving from Russia to EU keeping old setting would be painful. First, payment can be only done from Russian card. Second, by Russian regulations “Russian” users’ data must…
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TOC and collapsible block samples
I am writing some tool for my daily work that produces fancy HTML page from RHEL, CentOS or Fedora log and config files, so it would be more easy to read them. Nothing special, just some bash scripts with sed, grep and awk that produce HTML with some CSS and JQuery. TOC I really liked: http://projects.jga.me/toc/ It’s very easy to use and implement, it just…
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How to sort messages log
If you need to sort out what is reporting to the /var/log/messages to array in case of Red Hat Enterprise Linux or Fedora, you need to do flowing manipulations: read log; get 5th column from the log, it’s daemon name; get rid of all digits, so the daemons with different PIDs would be counted as one; 1. get rid of all ‘/’ and replace ‘[’ and ‘]’ with ‘\[’ and ‘\]’…
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Debugging Kerberos
If you need to debug Kerberos, check the time synchronization at the first place. In about 50% cases it is it. the ntpd (or chrony) should be presented in the process list they should really be configured correctly in case of the virtual host crony is preferable, with the ntpd time skew is possible Really nice crony/ntpd comparative chart: https://chrony.tuxfamily.org/comparison.html , “Summary” section is complete.
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Not to forget: ugly font and the Opera Browser
Might be interesting for non-English speaking users of the Opera: some font on some sites are really ugly and there is no way in the interface to disable them, because they’re not system fonts, but one that web page get downloaded. –disable-remote-fonts is the option to fix them forever. Such fonts usually contain normal English glyphs, bot other are ugly. To fix it in the Gnome Shell: cp /usr/share/applications/opera.desktop ~/.local/share/application Add…
Got any book recommendations?