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--- code:linux [2020/03/12 08:30]
hansek
+++ code:linux [2023/11/11 00:39] (current)
hansek [jq]
@@ Line 228: / Line 228: @@
 </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 =====
@@ Line 262: / Line 266: @@
 <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>

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