My blog

Author: shaman007

  • 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.

    1. TOC I really liked: http://projects.jga.me/toc/ It’s very easy to use and implement, it just looking through the document for h1, h2, etc tags. Scope and what tags to look can be customized.
    2. Collapsible blocks sample: https://codepen.io/peternguyen/pen/hICga/

    May be it would be yet another “log2html” framework in the end.

  • 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:

    1. read log;
    2. get 5th column from the log, it’s daemon name;
    3. 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 ‘\[’ and ‘\]’ to keep things both readable and usable for future scripting;

    1. sort unique stuff.

    in my case this gets look like:

    cat /var/log/messages | awk '{ print $5 }'| sed 's/\[[0-9].*$//'|sed 's/\[/\\\[/g' | sed 's/\]/\\\]/g'| sed 's/://g' |sed 's/\///g' |sort -u``

    the result is usable as array for example. My host’s result:

    abrt-hook-ccpp
    at-spi-bus-launcher
    audit
    avahi-daemon
    blueman.desktop
    blueman-mechanism
    bluetoothd
    chronyd
    cinnamon-killer-daemon
    cinnamon-session
    com.redhat.imsettings
    ...
    skip
    ...
    tracker-store.desktop
    udisksd
    usrlibexecgdm-x-session
    vmware-user.desktop
    wpa_supplicant
  • Debugging Kerberos

    If you need to debug Kerberos, check the time synchronization at the first place. In about 50% cases it is it.

    1. the ntpd (or chrony) should be presented in the process list
    2. they should really be configured correctly
    3. 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.

  • 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:

    1. cp /usr/share/applications/opera.desktop ~/.local/share/application
    2. Add –disable-remote-fonts to every “Exec”. Don’t touch “TryExec”
  • Not to forget useful vi and bash settings

    .bash_profile

    alias opera=opera --disable-remote-fonts
    alias grep='grep --color=auto'
    alias unigrep='grep -P "[^\x00-\x7F]"'
    alias mkdir="mkdir -p"
    alias ls='ls -lh --color=auto'
    HISTCONTROL=ignoredups:ignorespace
    HISTSIZE=100000
    HISTFILESIZE=200000

    .vimrc

    set mouse=r
    syntax enable
    set tabstop=4
    set softtabstop=4
    set expandtab
    set number
    set cursorline
    set hlsearch
    set incsearch  
    set showmatch
    nmap <F1> <Esc>:set nonumber<cr>                                                                                                                                             
    nmap <F2> <Esc>:set number<cr>
    nmap <F5> <Esc>yy<cr>
    nmap <F6> <Esc>p<cr>
    nmap <F8> <Esc>dd<cr>
    nmap <F10> <Esc>:wq!<cr>
    nmap <F12> <Esc>:q!<cr>

    Not sure about ‘number’ setting, if interferes with the clipboard annoyingly, so I can turn them off.

  • Simple way to fuck-up Gnome Shell in Fedora 25

    1. Open Evolution
    2. New message
    3. Attach file from Web DAV disk
    4. PROFIT!
  • FC 25 annoying auth bugs

    Evolution keeps failing to connect to Google calendars if it works for more than one day. Restarting goa-daemon with

    /usr/libexec/goa-daemon --replace

    does not always help. That is frustrating: why not always?

  • Evolution mail signature workaround

    Evolution mail application in the Fedora 25 has annoying bug: it freezes when trying to add/edit signature (although, you can delete old one). It’s a known bug fixed in upstream and you can actually edit signature files (it’s quite tricky), but you can add shell script that would generate signature for you.

    UPD: need to use “cowsay `fortune`”