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code:linux [2017/05/18 11:49]
hansek 		code:linux [2023/11/11 00:39] (current)
hansek [jq]
Line 145: Line 145:
 Pro více typů zopakovat celou konstrukci **! -name '*.html'** Pro více typů zopakovat celou konstrukci **! -name '*.html'**
  
 +Na ČH, kde je pouze `find`:
 +<code bash>
 +# on remote server
  
 +find . -type f -printf "%-.22T+ %M %n %-8u %-8g %8s %Tx %.8TX %p\n" > last_changes.txt
 +
 +# on localhost
 +
 +scp remote:last_changes.txt .
 +
 +cat last_changes.txt  | sort -r | cut -f 2- -d ' ' | head -20
 +
 +# or with striping some lines
 +
 +sed '/webcam/d' last_changed.txt | sort -r | cut -f 2- -d ' ' | head -20
 +</code>
 ===== Výpis 20 největších souborů na FS v rámci adresáře ===== ===== Výpis 20 největších souborů na FS v rámci adresáře =====
 Vynechání některých souborů viz předchozí. Vynechání některých souborů viz předchozí.
Line 213: Line 228:
 </code> </code>
  
 +  * rc = Remove - only Configs
 +  * ii = Install - Installed
  
 +[[https://askubuntu.com/a/18807|Vysvětlivky falgů na začátku výpisu dpkg --list]]
  
 +===== Disable / enable services from autostart =====
 +Source: https://askubuntu.com/a/27137
 +<code bash>
 +sudo update-rc.d mongodb disable
 +</code>
 +
 +
 +===== Postgres restore =====
 +
 +  * -F = ''--format=c|d|t''
 +  * -c = ''--clean''
 +  * -O = ''--no-owner''
 +  * -x = ''--no-privileges''
 +  * -j5 = use 5 parallel jobs
 +  * -d = database name
 +
 +<code bash>
 +pg_restore -Fc -Oxv -j5 -d <database-name> <dump-file>
 +</code>
 +
 +
 +===== Journal logy =====
 +
 +Pročištění logů, odmaže starší záznamy.
 +
 +<code bash>
 +sudo journalctl --vacuum-size=500M
 +</code>
 +
 +Nastavení limitu pro journal v ''sudo vim /etc/systemd/journald.conf'':
 +
 +<code bash>
 +SystemMaxUse=500M
 +</code>
 +
 +
 +===== Jaký proces využívá port =====
 +
 +<code bash>
 +lsof -i :80
 +</code>
 +
 +
 +===== Certbot / Certifikáty =====
 +
 +List of existing certificates on host
 +
 +<code bash>
 +certbot certificates
 +</code>
 +
 +Certificate detailed info
 +
 +<code bash>
 +openssl x509 -text -noout -in <cert-path>
 +</code>
 +
 +nebo online
 +
 +<code bash>
 +nmap -p 443 --script ssl-cert coex.cz
 +</code>
 +
 +
 +===== CPU iowait debug =====
 +
 +Source: https://haydenjames.io/what-is-iowait-and-linux-performance/
 +
 +<code bash>
 +atop  # run it with -d option or press d to toggle the disk stats view.
 +iostat -xm 2  # try it with the -xm 2 options for extended statistics, in megabytes and in two-second intervals.
 +iotop -oPa  # – top-like I/O monitor. Try it with the -oPa options to show the accumulated I/O of active processes only.
 +ps auxf  # – use auxf, then under the “STAT” column “D” usually indicates disk iowait.
 +strace  # – view the actual operations issued by a process. Read the strace man page.
 +lsof  # – after you’ve identified the process responsible, use -p [PID] to find the specific files.
 +</code>
 +
 +
 +
 +===== jq =====
 +
 +**Inplace transform Unix timestamp to Datetime inside json log**
 +
 +<code bash>
 +docker events | TZ=Europe/Prague jq '.time |= (strflocaltime("%Y-%m-%d %H:%M:%s %Z"))' -C | less
 +</code>
 +
 +**Inplace decode all k8s secrets values**
 +
 +<code bash>
 +kubectl get secrets postgres-secrets -o json | jq '.data | map_values(@base64d)'
 +</code>
code/linux.1495100989.txt.gz · Last modified: 2017/05/18 11:49 by hansek

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