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--- linux [2024/02/21 06:25] – nine
+++ linux [2026/04/26 13:41] (current) – [iptables/netfilter] nine
@@ Line 8: / Line 8: @@
 ===== iptables/netfilter =====
 Restrict to single host, e.g. for prometheus node exporter
+  # required for persisting rules
+  apt-get install iptables-persistent
+  # set rules
   iptables -N prometheus
   iptables -A prometheus --src <server-ip> -j ACCEPT
@@ Line 15: / Line 20: @@
   iptables -I INPUT -m tcp -p tcp --dport 9100 -j prometheus
+  # save persistent
+  iptables-save | tee /etc/iptables/rules.v4
 ===== docker =====
@@ Line 21: / Line 29: @@
   docker exec -ti <container-name> /bin/bash
+===== vim =====
+disable visual mode:
+  set mouse-=a
+or
+  set mouse=nicr
+===== Firefox =====
+  widget.non-native-theme.scrollbar.style
+  * 0: Standard-Stil der Plattform
+  * 1: macOS
+  * 2: GTK
+  * 3: Android
+  * 4: Windows 10
+  * 5: Windows 11
+  widget.non-native-theme.scrollbar.size.override
 ===== email =====
@@ Line 29: / Line 61: @@
   - https://senders.yahooinc.com/best-practices/
   - https://senders.yahooinc.com/faqs/
+  - https://www.bsi.bund.de/dok/TR-03182
+==== pdf ====
+default:
+  ps2pdf input.pdf output.pdf
+ghostscript options -dPDFSETTINGS
+  ps2pdf -dPDFSETTINGS=/ebook input.pdf output.pdf
+possible options:
+  -dPDFSETTINGS=/screen 	(72 dpi)
+  -dPDFSETTINGS=/ebook 	(150 dpi)
+  -dPDFSETTINGS=/prepress (300 dpi)
+  -dPDFSETTINGS=/printer 	(300 dpi)
+  -dPDFSETTINGS=/default 	Selects the output which is useful for multiple purposes. Can cause large PDFS.
+=== remove password ===
+  pdftk input.pdf input_pw "$PASSWORD" output out.pdf
 ===== Video =====