https://mossyoak.linuxwall.info/ 2026-04-13T22:17:35+00:00 https://mossyoak.linuxwall.info/ https://mossyoak.linuxwall.info/lib/tpl/dokuwiki/images/favicon.ico text/html 2024-04-17T10:19:58+00:00 Anonymous (anonymous@undisclosed.example.com) https://mossyoak.linuxwall.info/doku.php?id=en:ressources:astuces:archlinux_luks_install&rev=1713363598&do=diff Originally from <https://gist.github.com/mattiaslundberg/8620837>. Copied here for my own archive. Configure the wifi: wifi-menu Create partitions with fdisk Setup the encryption of the system cryptsetup luksFormat --type luks2 /dev/sdaX Open the partition and make an ext4 file system cryptsetup open /dev/sdaX cryptroot mkfs.ext4 /dev/mapper/cryptroot text/html 2024-04-17T10:19:58+00:00 Anonymous (anonymous@undisclosed.example.com) https://mossyoak.linuxwall.info/doku.php?id=en:ressources:astuces:cpu_process_usage&rev=1713363598&do=diff Calculate the CPU usage of a single process in Linux The script below calculates the CPU usage of a single process. It does so by parsing the stat file in /proc/<pid> and dividing it with the total cpu usage from /proc/stat. #!/usr/bin/env bash # calculate the cpu usage of a single process # jvehent oct.2013 [ -z $1 ] && echo "usage: $0 <pid>" sfile=/proc/$1/stat if [ ! -r $sfile ]; then echo "pid $1 not found in /proc" ; exit 1; fi proctime=$(cat $sfile|awk '{print $14}') totaltime=$(gre… text/html 2024-04-17T10:19:58+00:00 Anonymous (anonymous@undisclosed.example.com) https://mossyoak.linuxwall.info/doku.php?id=en:ressources:astuces:ffmpeg&rev=1713363598&do=diff FFMPEG Video Encoding - Convert Sony's HD MTS format into MP4 see: <http://flash.flowplayer.org/forum/7/12671> This works on Ubuntu 12.10 with ffmpeg 0.8.3-6ubuntu2 $ ffmpeg -y -i input.MTS -threads 6 -ar 44100 -ab 96k -acoder aac -ac 2 -vcodec libx264 -level 41 -crf 20 -bufsize 20000k -maxrate 25000k -g 250 -r 20 -s 1280x544 -coder 1 -flags +loop -cmp +chroma -partitions +parti4x4+partp8x8+partb8x8 -subq 7 -me_range 16 -keyint_min 25 -sc_threshold 40 -i_qfactor 0.71 -rc_eq 'blurCplx^(1-qC… text/html 2024-04-17T10:19:58+00:00 Anonymous (anonymous@undisclosed.example.com) https://mossyoak.linuxwall.info/doku.php?id=en:ressources:astuces:gnupg_pgp&rev=1713363598&do=diff GnuPG PGP tips & tricks - Basics - export public key gpg --export -a 'email@example.net' - export secret key gpg --export-secret-key -a 'email@example.net' - import secret key gpg --allow-secret-key-import --import private.key - Get details on key, signature, anything text/html 2024-04-17T10:19:58+00:00 Anonymous (anonymous@undisclosed.example.com) https://mossyoak.linuxwall.info/doku.php?id=en:ressources:astuces:golang&rev=1713363598&do=diff Golang tips Building for multiple platforms Check out the source, and from the src directory, run the following loop: $ for os in linux darwin windows; do for arch in 386 amd64; do echo ===== building $os/$arch =====; sleep 3; GOARCH=$arch GOOS=$os ./make.bash --no-clean 2>&1 ; done ;done text/html 2024-04-17T10:19:58+00:00 Anonymous (anonymous@undisclosed.example.com) https://mossyoak.linuxwall.info/doku.php?id=en:ressources:astuces:jmeter&rev=1713363598&do=diff Client/Server Jmeter The trick to use client/server mode with jmeter is that the client and the server need to be able to establish connections to each other. From the doc: “JMeter/RMI requires a connection from the client to the server. This will use the port you chose, default 1099. JMeter/RMI also requires a reverse connection in order to return sample results from the server to the client. This will use a high-numbered port. If there are any firewalls or other network filters between JMete… text/html 2024-04-17T10:19:58+00:00 Anonymous (anonymous@undisclosed.example.com) https://mossyoak.linuxwall.info/doku.php?id=en:ressources:astuces:kibana4_nginx&rev=1713363598&do=diff Protect Kibana 4 with Nginx Kibana 4 is a great dashboard application, but it comes with zero security. If you want to share a dashboard while preventing other people from modifying your data, you need to filter the traffic directed to it. This is hard to do, because kibana uses javascript in the browser that sends queries to elasticsearch (proxied via the /elasticsearch/ endpoint of the kibana4 app). Therefore, in order to protect it, we need fine grained query filters in nginx. text/html 2024-04-17T10:19:58+00:00 Anonymous (anonymous@undisclosed.example.com) https://mossyoak.linuxwall.info/doku.php?id=en:ressources:astuces:ldapsearch&rev=1713363598&do=diff LdapSearch examples The following examples are taking from various ldapsearch queries on Small Business Server 2003. Get a user from Active Directory ldapsearch -x -LLL -D 'CN=Administrator,CN=Users,DC=Domain,DC=local' -W -H ldap://ad.example.com:389 -b 'OU=SBSUsers,OU=Users,OU=MyBusiness,DC=Domain,DC=local' -s sub '(sAMAccountName=jean-kevin)' text/html 2024-04-17T10:19:58+00:00 Anonymous (anonymous@undisclosed.example.com) https://mossyoak.linuxwall.info/doku.php?id=en:ressources:astuces:lenovo_trackpoint_speed&rev=1713363598&do=diff Adjust the speed of the trackpoint on a Lenovo Carbon X1 1. find the trackpoint device $ find /sys/devices/platform/i8042 -name name | xargs grep -Fl TrackPoint | sed 's/\/input\/input[0-9]*\/name$//' /sys/devices/platform/i8042/serio1/serio2 2. set an appropriate value text/html 2024-04-17T10:19:58+00:00 Anonymous (anonymous@undisclosed.example.com) https://mossyoak.linuxwall.info/doku.php?id=en:ressources:astuces:lscolor&rev=1713363598&do=diff Change default LS colors on Debian By default, the LS version of Debian uses a regular blue color for the directories. And, as many others, I'm completely unable to read this on a black background. So, to change this, do the following for each user, or globally in text/html 2024-04-17T10:19:58+00:00 Anonymous (anonymous@undisclosed.example.com) https://mossyoak.linuxwall.info/doku.php?id=en:ressources:astuces:lxde_debian_autostart&rev=1713363598&do=diff Autostart applications at login with LXDE and Debian This is pretty straighforward, if you know were to put the files. LXDE uses freedesktop.org Autostart spec which states that : <note>The Autostart Directories are $XDG_CONFIG_DIRS/autostart [...]</note> Good, then what's mine ? text/html 2024-04-17T10:19:58+00:00 Anonymous (anonymous@undisclosed.example.com) https://mossyoak.linuxwall.info/doku.php?id=en:ressources:astuces:macos&rev=1713363598&do=diff MacOS tips Networking Get IP address $ sudo ipconfig getifaddr en1 Change IP address $ sudo ipconfig set en1 INFORM 172.21.15.249 255.255.255.248 Change default gateway $ sudo route delete default $ sudo route add default 172.21.15.254 Users text/html 2024-04-17T10:19:58+00:00 Anonymous (anonymous@undisclosed.example.com) https://mossyoak.linuxwall.info/doku.php?id=en:ressources:astuces:mutt-kz_gpgme&rev=1713363598&do=diff Building Mutt-KZ with GPGME support - Get the source from github git clone git@github.com:karelzak/mutt-kz.git - Dependencies $ sudo yum install slang-devel openssl-devel cyrus-sasl-devel tokyocabinet-devel - Compile Configure, you'll need to resolve a bunch of dependencies text/html 2024-04-17T10:19:58+00:00 Anonymous (anonymous@undisclosed.example.com) https://mossyoak.linuxwall.info/doku.php?id=en:ressources:astuces:mutt_alias_vcard&rev=1713363598&do=diff Convert VCARDs into Mutt's alias format The script below reads a vcard file and grabs the FN and EMAIL fields to display them into the alias format. It's a very simple script that will not deal with wrongly formatted VCARD files. I have used it to convert roundcube's contacts export into an alias file. text/html 2024-04-17T10:19:58+00:00 Anonymous (anonymous@undisclosed.example.com) https://mossyoak.linuxwall.info/doku.php?id=en:ressources:astuces:mutt_macosx&rev=1713363598&do=diff Installing and configuring Mutt on MacOSX Mutt 1.5.20 on Mac OS X snow leopard. 1. Get mutt and patch it $ wget ftp://ftp.mutt.org/mutt/devel/mutt-1.5.20.tar.gz $ tar -xzvf mutt-1.5.20.tar.gz $ cd mutt-1.5.20 Download and apply sidebar patch text/html 2024-04-17T10:19:58+00:00 Anonymous (anonymous@undisclosed.example.com) https://mossyoak.linuxwall.info/doku.php?id=en:ressources:astuces:netinstall_usb&rev=1713363598&do=diff Debian NetInstall from USB stick - Format the stick # fdisk /dev/sdb d -> delete all partition n -> create a new primary t -> type '6' for vfat 16 a -> toggle bootable flag w -> write and exit # mkfs.vfat -F 16 /dev/sdb1 - Install the syslinux MBR text/html 2024-04-17T10:19:58+00:00 Anonymous (anonymous@undisclosed.example.com) https://mossyoak.linuxwall.info/doku.php?id=en:ressources:astuces:policy_routing&rev=1713363598&do=diff Linux Policy Routing Create a custom routing table echo 200 custom >> /etc/iproute2/rt_tables Route a source IP using the custom table ip rule add from 172.21.4.156 lookup custom Add a rule to the table that change the default gateway to a VPN text/html 2024-04-17T10:19:58+00:00 Anonymous (anonymous@undisclosed.example.com) https://mossyoak.linuxwall.info/doku.php?id=en:ressources:astuces:process_sniffing&rev=1713363598&do=diff Sniff the data passing through a Linux Process Another way to identify what is received by your application is to use strace and lsof. This is particularly useful if you can't TCPdump for some reason. Here's an example of how to do it on the Ossec Analysisd process. text/html 2024-04-17T10:19:58+00:00 Anonymous (anonymous@undisclosed.example.com) https://mossyoak.linuxwall.info/doku.php?id=en:ressources:astuces:rabbitmq&rev=1713363598&do=diff Rabbitmq tips Deleting queues The command line can be used to list existing queues: # rabbitmqctl list_queues And the API can be used to delete them: curl -i -u guest:guest -H "content-type:application/json" -XDELETE http://localhost:15672/api/queues/%2F/mig.keepalive text/html 2024-04-17T10:19:58+00:00 Anonymous (anonymous@undisclosed.example.com) https://mossyoak.linuxwall.info/doku.php?id=en:ressources:astuces:sieve&rev=1713363598&do=diff Filter your emails with sieve # apt-get install sieve-connect Connexion to Sieve $ sieve-connect -s localhost -p 4190 -u julien -m plain connecting to localhost Please enter your password: > ls filters_julien.sieve <- active script > get filters_julien.sieve Filtre_Sieve_Julien require … text/html 2024-04-17T10:19:58+00:00 Anonymous (anonymous@undisclosed.example.com) https://mossyoak.linuxwall.info/doku.php?id=en:ressources:astuces:soundstretch&rev=1713363598&do=diff Sorting music by BPM count Sorting music by BPM count can be useful to build a collection of a specific tempo. Linux has a few tools that can count the beat per minute of a song, and while their accuracy is far from 100%, they can help built a playlist that can then be filtered manually. text/html 2024-04-17T10:19:58+00:00 Anonymous (anonymous@undisclosed.example.com) https://mossyoak.linuxwall.info/doku.php?id=en:ressources:astuces:tcpdump&rev=1713363598&do=diff TCPDUMP tips and tricks Multiple tcpdump processes in tmux Useful on KVM hypervisors with dozens of vnet interfaces. #!/bin/bash # create a master tmux session tmux new-session -s 'tcpdump' # create each tcpdump process in a new tmux window for interface in \ $(ip a|grep -v "^ "|awk '{print $2}'|cut -d ':' -f 1|egrep -v "lo|br") do tmux new-window -t "tcpdump:$interface" \ -n "vnet$interface" "tcpdump -s 17000 -G 1800 \ -w "$(hostname)-$interface-%Y%m%d-%H%M%S.pcap" \ -Svni $interf… text/html 2024-04-17T10:19:58+00:00 Anonymous (anonymous@undisclosed.example.com) https://mossyoak.linuxwall.info/doku.php?id=en:ressources:astuces:tmux&rev=1713363598&do=diff Tmux configuration file #remap command to ctrl+a set -g prefix C-a # reduce command delay set -s escape-time 1 # first window is number 1, not zero set -g base-index 1 set -g pane-base-index 1 # reload conf with command+r bind r source-file ~/.tmux.conf \; display "Reloaded!" # remap window split commands bind | split-window -h bind - split-window -v # remap pane movements bind h select-pane -L bind j select-pane -D bind k select-pane -U bind l select-pane -R # disable the mouse setw -g … text/html 2024-04-17T10:19:58+00:00 Anonymous (anonymous@undisclosed.example.com) https://mossyoak.linuxwall.info/doku.php?id=en:ressources:astuces:udev_hdmi&rev=1713363598&do=diff Toggle an external HDMI display using udev Use udevadm monitor to detect udev events when connecting or disconnecting the display: $ udevadm monitor monitor will print the received events for: UDEV - the event which udev sends out after rule processing KERNEL - the kernel uevent <connecting the display> KERNEL[549920.709264] change /devices/pci0000:00/0000:00:02.0/drm/card0 (drm) UDEV [549920.712808] change /devices/pci0000:00/0000:00:02.0/drm/card0 (drm) <disconnecting the display> KE… text/html 2024-04-17T10:19:58+00:00 Anonymous (anonymous@undisclosed.example.com) https://mossyoak.linuxwall.info/doku.php?id=en:ressources:astuces:vim&rev=1713363598&do=diff Replace [:something] with ['something'] :%s/\[:\(\w\+\)\]/['\1']/g text/html 2024-04-17T10:19:58+00:00 Anonymous (anonymous@undisclosed.example.com) https://mossyoak.linuxwall.info/doku.php?id=en:ressources:astuces:xargs&rev=1713363598&do=diff Some fun with XARGS Run a task on 16 processors $ ls *.txt |xargs -P 16 -n 1 bzip2 -9 takes all .txt file and bzip them separatly text/html 2024-04-17T10:19:58+00:00 Anonymous (anonymous@undisclosed.example.com) https://mossyoak.linuxwall.info/doku.php?id=en:ressources:astuces:yum_versionlock&rev=1713363598&do=diff Pin YUM packages with versionlock So you want to use yum-cron to autoupdate your system but skip some packages? versionlock is the way to go. - Install versionlock $ sudo yum install yum-plugin-versionlock - Pin a package $ sudo yum versionlock add puppet