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Git

Init

  1. $ git init name.git
  2. $ git remote -v; git remote add origin https://github.com/username/name.git; git remote -v
  3. $ git pull
  4. $ git push -u origin master

Ssh key identification

$ git remote set-url origin [email protected]:user/my-repo.git

Branch

  1. git checkout master
  2. git branch pr1
  3. git checkout pr1
  4. edit files
  5. git add somefile1 somefile2
  6. git commit
  7. git push origin pr1
  8. git checkout master

Sync fork

  1. git status
  2. git remote -v
  3. git remote add upstream https://github.com/org-repo
  4. git remote -v
  5. git fetch upstream
  6. git checkout master
  7. git merge upstream/master

Drop

  1. git rebase -i HEAD~4
  2. change 'pick' to 'drop'
  3. git push --force

Shell

  • Ctrl-r, setopt no_flow_control (zsh), stty -ixon (bash), Ctrl-s
  • C-e, C-a, C-r
  • M-.
  • M-# (bash), bindkey '^[#' pound-insert (zsh)
  • C-d, M-d, C-w
  • C-x, C-e
  • C-u (bash/zsh), C-k, C-y
  • cd !$, sudo !!, $1, $2, $3, $@, $0, $#, $*, $_, $? (see special parameters)
  • ls | grep | sed 'p;s/a/b/' | xargs -n2 echo, mv
  • ls | awk '{printf("\"%s\"\n",$0); gsub("[ \047]","",$0); print $1}' | xargs -n2 echo, mv
  • sensors | awk '/Core/ {gsub("[+°C]","",$3); a=a+$3; i++} END {print a/i}
  • for i in $(seq 10); do echo $((a=a+i)) ; done, a=1 ; for i in $(seq 10); do echo $((a=a*i)) ; done, a=0; b=0; c=1; for i in $(seq 10); do echo "$((a=b)), $((b=c)), $((c=b+a))" ; done
  • [[ 0 -eq $? ]] && echo true || echo false
  • lsblk -f, mount -v -t /dev/sdX /mnt, lsblk, gdisk /dev/sdX (xzyy), sudo dd if=new.iso of=/dev/sdX bs=1M status=progress, sudo umount -v /mnt, sudo fdisk -l
  • find . -name "*.torrent" -exec rm -rf {} \;
  • echo "keymaps 0-255\nkeycode 58 = Control\nkeycode 29 = Caps_Lock" > /etc/my_caps_ctrl.kmap; sudo loadkeys /etc/my_caps_ctrl.kmap
  • gunzip dvorak.map.gz, sudo cp dvorak.map my_dvorak.map, vi my_dvorak.map, gzip my_dvorak.map, sudo cp ~/my_dovak.map.gz /usr/?lib?/kbd/keymaps/legacy/i386/dvorak/my_dvorak.map.gz, localectl set-keymap my_dvorak
  • for file in $DIR/*my_string*.txt ; do echo "$file" ; done, for file in $DIR/*my_string*.txt ; do mv -nv -- "$file" "$file.$(date +%Y%m%d)" ; done, for file in *; do echo-mv "$" $(echo $file | sed 's/regex/replace_text/'); done
  • du -h | sort -nr | head
  • gnuplot -e 'plot for [file in system("find . -depth 1 -type f -print")] file u 3:2'
  • until timeout 5s sleep 6 ; do echo $(( i=i+1 )) ; done
  • ^foo^bar^:G, !!:gs/foo/bar/
  • line=$(sed -n '123p' file.txt | tr -s '\t' ' ' | cut -d' ' -f1)
  • journalctl --vacuum-time=2d, journalctl --vacuum-size=100M
  • for file in /proc/*/status ; do awk '/VmSwap|Name/{printf $2 " " $3}END{ print ""}' $file; done | sort -k 2 -n -r | less
  • du --separate-dirs --all --time --threshold=1G --human-readable
  • crontab -e, * * * * * XDG_RUNTIME_DIR=/run/user/$(id -u) notify-send Hey "this is dog!"
  • du -a . | sort -n -r | head -n 50, find -type f -exec du -Sh {} + | sort -rh | head -n 50
  • convert image.heavy new_image.light, ffmpeg -i audiofile_input.light -vn audiofile_output.light, ffmpeg -i input_video.heavy output_video.light

Misc (https://opensource.com/)

  • smem --pie name -c pss
  • echo 'smem -c pss -P "$1" -k -t | tail -n 1' > ~/bin/memory-use && chmod +x ~/bin/memory-use, memory-use firefox
  • sudo shred -vfz /dev/sdX, sudo dd if=shredos.img of=/dev/sdX bs=4M status=progress, sudo umount /dev/sdXY -l ; sudo dd if=/dev/urandom of=/dev/sdX bs=10M, sudo nvme sanitize /dev/nvme0nX
  • wget --max-redirect 0 http://iana.org, --mirror, wget --continue https://example.com/linux-distro.iso
  • ping -D 8.8.8.8, ping -s 2, ping -w 6, host example.com
  • procps-ng: pidof bash, pgrep .sh, fuser --user ~/example.txt, ps 3234, ps -e | less, ps -U tux | less, pstree -U tux -u --show-pids, ps -U tux -u, pmap 1776
  • cron: 01 01 * * * /usr/local/bin/rsbu -vbd1 ; /usr/local/bin/rsbu -vbd2, 03 05 * * * /sbin/hwclock --systohc, 25 04 1 * * /usr/bin/dnf -y update, 00 15 * * Thu /usr/local/bin/mycronjob.sh, 02 03 1 1,4,7,10 * /usr/local/bin/reports.sh, 01 09-17 * * * /usr/local/bin/hourlyreminder.sh, */5 08-18/2 * * * /usr/local/bin/mycronjob.sh, 04 07 * * * student /usr/local/bin/mycronjob.sh, /etc/cron.d
  • awk: gawk 'pattern {action}' file1 file2 ..., gawk -F: '{print "uid", $3;}' /etc/passwd, gawk /^[A-Z]s/exp1/&exp2/g
  • irc: /msg NickServ REGISTER password [email protected], /msg NickServ IDENTIFY nick password, /query nick, /motd, /topic
  • net: nslookup example.com, telnet example.com 110, openssl s_client -starttls smtp -connect example.com:587, netstat --listening --all --route --interfaces, systemctl restart network, tcpdump -i eth0,
  • nmcli: device, device show eth0, connection, connection up foo, device wifi connect foo
  • ip: route, route add default gw 10.0.0.1, addr show, neighbor show, arp
  • firewall: firewall-cmd --get-active-zones, -–change-interface eth0 --zone=example, --get-services, --add-service samba --zone=example, --add-port=123/tcp --zone=example, --permanent
  • ssh: -D <port> <remote_host>, -L <port>:<target_host>:3389 <bastion_server>, -L 5901:localhost:5901 <remote_host>, ssh-keygen, ssh-keygen -p, ssh-copy-id -i <identity file> <remote_host>, -i <identity file>, -p <remote port>, -C, -D <port>, -X, -A , -4, -6, -L <local port>:<target host>:<target port>
$ ssh myhouse
${HOME}/.ssh/config
host myhouse
 User itsme
 HostName house.example.com
  • forward tunnel: ssh -p vps-open-port -i ~/.ssh/vps-key vps-user@vps-public-ip -L localhost-random-port:vps-private-ip:vps-website-port-say-80, http://localhost:localhost-random-port
  • reverse tunnel: ssh -v -p vps-open-port -i ~/.ssh/vps-key vps-user@vps-ip -R vps-random-port:localhost:localhost-open-port-say-22, ssh -v -p vps-random-port -i ~/.ssh/vps-key user-on-local-computer@vps-ip

Bash lists

Syntax Result
arr=() Create an empty array
arr=(1 2 3) Initialize array
${arr[2]} Retrieve third element
${arr[@]} Retrieve all elements
${!arr[@]} Retrieve array indices
${#arr[@]} Calculate array size
arr[0]=3 Overwrite 1st element
arr+=(4) Append value(s)
str=$(ls) Save ls output as a string
arr=( $(ls) ) Save ls output as an array of files
${arr[@]:s:n} Retrieve n elements starting at index s

Prompt

  • export TERM=xterm-256color
  • setxkbmap us -variant dvorak
  1. Bash
PS1="" # reset
PS1="$PS1\[\e[0m\]\[\e[03;32m\]\u" # user
PS1="$PS1\[\e[0m\]\[\e[01;35m\]@" # separator
PS1="$PS1\[\e[0m\]\[\e[01;36m\]\h" # host
PS1="$PS1\[\e[0m\]\[\e[01;35m\]:" # separator
PS1="$PS1\[\e[0m\]\[\e[48;5;95;38;5;214m\]\D{%d.%m@%H.%M.%S}" # date
PS1="$PS1\[\e[0m\]\[\e[01;35m\]:" # separator
PS1="$PS1\[\e[0m\]\[\e[01;34m\]\w" # path
PS1="$PS1\[\e[0m\]\[\e[01;35m\]:" # separator
PS1="$PS1\[\e[0m\]\[\e[01;37m\]$?" # last error code
PS1="$PS1\[\e[0m\]\[\e[01;35m\]:\$\[\e[00m\] " # ending
  1. Zsh
PS1="%K{032}%B%n%b%k"
PS1="$PS1 %F{magenta}%K{grey}%B@%b%k%f"
PS1="$PS1 %K{green}%F{118}%B%m%b%f%k"
PS1="$PS1 %F{magenta}%K{grey}%B:%b%k%f"
PS1="$PS1 %K{054}%F{208} %T - %W %f%k"
PS1="$PS1 %F{blue}%F{magenta}%K{grey}%B:%b%k%f"
PS1="$PS1 %K{105}%F{11} %~/ %f%k%F{magenta}%K{grey}%B>%b%k %f"
RPS1="%(?.%F{green}0.%K{red}%F{011})%(?..(%?%))%(?.%f.%f%k)%F{magenta}%K{grey}:%k%f%F{105}%2c%f"
  1. Bash root
RED='\[\033[0;31m\]'
WHITE='\[\033[1;37m\]'
GRAY='\[\033[0;37m\]'
BROWN='\[\033[0;33m\]'
PS1="$RED[$WHITE\u$BROWN@$WHITE\h$BROWN:$WHITE\W$RED] #$GRAY "
  1. Bash admin
GREEN='\[\033[0;32m\]'
BROWN='\[\033[0;33m\]'
WHITE='\[\033[1;37m\]'
WHITEUNDLN='\[\033[4;37m\]'
GRAY='\[\033[0;37m\]'
CYAN='\[\033[0;36m\]'
PS1="$GREEN[$WHITE\u$CYAN@$WHITE\h$CYAN:$BROWN\w$GREEN] \$ $GRAY"

alias rm='rm -i'
alias mv='mv -i'
alias cp='cp -i'
alias ..='cd ..'
alias ...='cd ../..'
alias v='vim'
alias ve='sudo vim'
alias e='emacs'
alias se='sudo emacs'

Screensaver

  1. xset s off
  2. xset s noblank
  3. xset dpms 0 0 0
  4. xset -dpms

Emacs

  • M-x M-p
  • M-x tdoe
  • etags ~/dir/*.c, M-.
  • M-x transparency
  • C-u C-SPC
  • (setq mouse-yank-at-point t)

Evil

  • ~, g~ ; visual u, U, guw, vim :help ~

NeoVim

  • "+y, "+p
  • ~/.config/nvim/init.vim, echom "I am here", set termguicolors, set mouse=a, set nohlsearch
  • vnoremap <C-C> y:call system("wl-copy --trim-newline", @")<cr>, inoremap <C-V> <ESC>:let @"=substitute(system("wl-paste --no-newline"), '<C-v><C-m>', '', 'g')<cr>pa
  • delete every other line: :g/^/+d

Screen command

escape ^z^z

bindkey -k k6 prev
bindkey -k k7 next

bindkey -k k8 focus prev
bindkey -k k9 focus next

caption always " %w %= %c "

Salt

Checksum

  • sha1sum file, sha256sum file, md5sum file
  • echo -n "my_string" | openssl dgst -sha256, echo -n "my_string" | sha256sum

Sha256 signature

  • openssl dgst -sha256 message.txt
  • openssl dgst -sha256 -sign privatekey.pem -out signature.bin message.txt
  • openssl dgst -sha256 -verify publickey.pem -signature signature.bin message.txt

ECDSA signature

  • openssl ecparam -genkey -name secp256k1 -noout -out eccprivatekey.pem
  • openssl dgst -ecdsa-with-SHA1 -sign eccprivatekey.pem message.txt > ecsign.bin
  • openssl dgst -ecdsa-with-SHA1 -verify eccpublickey.pem -signature ecsign.bin message.txt
  • openssl req -new -key eccprivatekey.pem -x509 -nodes -days 365 -out ecccertificate.pem
  • openssl x509 -in ecccertificate.pem -text -noout

Key generation, exchange, encryption

  • cat /etc/distrib-release, openssl version
  • openssl genrsa -aes128 -out private_key.pem 1024: 1024-bit public/private RSA key pair (+passphrase)
  • ls -l private_key.pem, file private_key.pem, head private_key.pem
  • openssl rsa -in private_key.pem -noout -text
  • openssl rsa -in private_key.pem -pubout > public_key.pem
  • ls -l *.pem
  • openssl rsa -in public_key.pem -pubin -text -noout
  • echo "my text to encrypt" > secret.txt
  • openssl rsautl -encrypt -inkey public_key.pem -pubin -in secret.txt -out secret.enc, hexdump -C ./secret.enc
  • openssl rsautl -decrypt -inkey private_key.pem -in secret.enc > secret_decipher.txt

Clean fingerprints

  • mv ~/.ssh/known_hosts ~/.ssh/known_hosts.old
  • ssh-keygen -R HOSTNAME

Certificates

from https://nps.edu/web/c3o/labtainers

Authority

  • openssl genrsa -des3 -out private/ca.key.pem 2048
  • openssl rsa -in private/ca.key.pem -text
  • openssl req -config openssl.cnf -new -x509 -days 1825 -extensions v3_ca -key private/ca.key.pem -out ca.crt.pem

Server

  • openssl genrsa -des3 -out server.key.pem 1024
  • openssl req -config openssl.cnf -new -key server.key.pem -out server.req.pem
  • openssl ca -config openssl.cnf -in server.req.pem -out server.crt.pem -extensions server

OCSP

  • openssl genrsa -des3 -out ocsp.key.pem 1024
  • openssl req -config openssl.cnf -new -key ocsp.key.pem -out ocsp.req.pem
  • openssl ca -config openssl.cnf -in ocsp.req.pem -out ocsp.crt.pem -extensions ocsp_ext

Arch

  1. loadkeys dvorak
  2. ip link
  3. ping archlinux.org
    • echo "[Match]\nName=enpXYZ\n\n[Network]\nDHCP=yes" > /etc/systemd/network/20-wired.network
    • systemctl start systemd-networkd.service
    • systemctl start dhcpcd.service
    • ping archlinux.org
  4. timedatectl set-ntp true
  5. fdisk -l
  6. mkfs.ext4 /dev/sdXX
  7. mkswap /dev/sdXY
  8. mount /dev/sdXX /mnt
  9. swapon /dev/sdXY
  10. mount /dev/sdXZ /home
  11. curl -s "https://archlinux.org/mirrorlist/?country=FR&country=GB&protocol=https&use_mirror_status=on" | sed -e 's/^#Server/Server/' -e '/^#/d' > /etc/pacman.d/mirrorlist.backup
  12. pacman -Sy pacman-contrib
  13. rankmirrors -n 10 /etc/pacman.d/mirrorlist.backup > /etc/pacman.d/mirrorlist
  14. pacstrap /mnt base linux linux-firmware
    • vi /etc/pacman.d/gnupg/gpg.conf, keyserver hkp://keyserver.ubuntu.com, pacman-key --populate archlinux, pacman -Sc
    • pacman -Sy archlinux-keyring
    • pacstrap /mnt base linux linux-firmware
  15. genfstab -U /mnt >> /mnt/etc/fstab, vi /mnt/etc/fstab
  16. arch-chroot /mnt
  17. ln -sf /usr/share/zoneinfo/Region/City /etc/localtime
  18. hwclock --systohc
  19. echo "en_US.UTF-8 UTF-8" > /etc/locale.gen
  20. locale-gen
  21. echo LANG=en_US.UTF-8 > /etc/locale.conf
  22. echo KEYMAP=dvorak > /etc/vconsole.conf
  23. echo mypcname > /etc/hostname
  24. echo "127.0.1.1 mypcname.localdomain mypcname" > /etc/hosts
  25. mkinitcpio -P
  26. passwd
  27. pacman -Sy grub os-prober
  28. grub-install --target=i386-pc /dev/sdX
  29. grub-mkconfig –o /boot/grub/grub.cfg
  30. exit
  31. reboot

Sway

Bars

  • fan=$(sensors | awk '/^fan1/{print $2 " rpm"}')
  • echo -e "<span foreground='#c1a000'> </span><span foreground='#c16b26'> $fan </span>" \|
  • tempcpu=$(sensors | awk '/Core/ {gsub("[+°C]","",$3); a=a+$3; i++} END {printf("%4.1f",a/i)}')
  • tempgpu=$(sensors | awk '/^temp/ {gsub("[+°C]","",$2); print $2}')
  • xkb_switch=$(swaymsg -t get_inputs | jq -r '.[] | select(.identifier == "1241:41096:HID_04d9:a088") | .xkb_active_layout_name')
  • Mem=$(vmstat -s | sed -n 2p | sed s/[^0-9]//g), Mem=$(echo "scale=1;${Mem}/1048576" | bc -l)
  • TotalMem=$(vmstat -s | sed -n 1p | sed s/[^0-9]//g), TotalMem=$(echo "scale=1;${TotalMem}/1048576" | bc -l)
  • load=$(cut -d ' ' -f1 /proc/loadavg)
  • disk_root=$(df -h -P -l '/' | awk '/G/ {print $4}' | sed 's/G//g'), disk_home=$(df -h -P -l ~ | awk '/G/ {print $4}' | sed 's/G//g')
  • ip=$(hostname -i | awk '{ print "" $1 }')
  • date_formatted=$(date "+%a %F %H:%M:%S")

Mako

exec mako
bindsym $mod+comma exec makoctl dismiss
bindsym $mod+period exec makoctl invoke
bindsym $mod+shift+comma  exec makoctl dismiss -a
bindsym $mod+shift+period exec makoctl menu wofi -d -p 'Choose Action: '

Wheather

bindsym $mod+Scroll_Lock exec ~/bin/run_with_sway_command.sh 'floating enable, resize set 1200 800' \
kitty -e zsh -c 'curl https://wttr.in/ && read "?Press enter to continue"'

Screenshots

# Take a screenshot with all outputs and save it into the $screenshots directory (jpeg format: -t jpeg)
bindsym Print exec grim ~/screenshots/$(date +%Y-%m-%d_%H-%M-%S).png
# Take a screenshot with the region selected (jpeg format: -t jpeg) 
bindsym $mod+Print exec grim -g "$(slurp)" ~/screenshots/$(date +%Y-%m-%d_%H-%M-%S).png

Xubuntu

StumpWM

  • (define-key *top-map* (stumpwm:kbd "s-F1") "exec slock")
  • (define-key *top-map* (stumpwm:kbd "s-S-F2") "loadrc")
  • (define-key *top-map* (stumpwm:kbd "s-F2") "gnew")
  • (define-key *top-map* (stumpwm:kbd "s-F3") "exec kitty")
  • (define-key *top-map* (stumpwm:kbd "M-F4") "delete")
  • (define-key *top-map* (stumpwm:kbd "s-S-F12") "exec poweroff")
  • (define-key *top-map* (stumpwm:kbd "s-Left") "move-focus left"), Down, Right, Up
  • (define-key *top-map* (stumpwm:kbd "s-S-Left") "move-window left")
  • (define-key *top-map* (stumpwm:kbd "s-n") "next-in-frame")
  • (define-key *top-map* (stumpwm:kbd "s-o") "other-in-frame")
  • (define-key *top-map* (stumpwm:kbd "s-;") "exchange-direction left")
  • (define-key *top-map* (stumpwm:kbd "s-q") "exchange-direction right")
  • (define-key *top-map* (stumpwm:kbd "s-'") "gnext")
  • (define-key *top-map* (stumpwm:kbd "s-a") "gprev")
  • (define-key *top-map* (stumpwm:kbd "s-\"") "gnext-with-window")
  • (define-key *top-map* (stumpwm:kbd "s-A") "gprev-with-window")

Xfce

  • xfce4-panel
  • xfce4-screenshoter
  • blueman-manager
  • xset s off, xset s noblank, xset dpms 0 0 0, xset -dpms

Networking

Dnsmasq

  1. /etc/dnsmasq.conf
server=8.8.8.8
server=8.8.4.4
interface=LAN-interface-on-GATEWAY
dhcp-range=172.168.1.2,172.168.1.5
  1. /etc/hosts
127.0.0.1	localhost
127.0.1.1	gateway-hostname1or2
172.168.1.1	gateway-hostname2or1
172.168.1.2	mypc1-hostname
172.168.1.3	mypc2-hostname
  1. /etc/resolv.conf
nameserver 127.0.0.1
  1. ip addr add 172.168.1.1/24 dev LAN-interface-on-GATEWAY, ?ip addr add 172.168.1.2/24 via 172.168.1.1 dev LAN-interface-on-HOST, ip route add default via 172.168.1.1 dev LAN-interface-on-HOST
  2. iptables -t nat -A POSTROUTING -o WAN-interface-on-GATEWAY -j MASQUERADE, iptables -A FORWARD -i LAN-interface-on-GATEWAY -o WAN-interface-on-GATEWAY -j ACCEPT
  3. sysctl net.ipv4.ip_forward, sudo sysctl -w net.ipv4.ip_forward=1

Isc-dhcp-server

  1. sudo apt install isc-dhcp-server
  2. /etc/dhcp/dhcpd.conf
default-lease-time 600;
max-lease-time 7200;
option subnet-mask 255.255.255.0;
option broadcast-address 172.168.1.255;
option routers 172.168.1.1;
option domain-name-servers 8.8.8.8, 4.4.4.4, 1.1.1.1;

subnet 172.168.1.0 netmask 255.255.255.0 {
option routers 172.168.1.1;
option subnet-mask 255.255.255.0;
option broadcast-address 172.168.1.255;
option domain-name-servers 8.8.8.8, 4.4.4.4, 1.1.1.1;
range 172.168.1.2 172.168.1.5;
default-lease-time 86400;
max-lease-time 86400;
} 
ddns-update-style none;
  1. /etc/default/isc-dhcp-server
INTERFACESv4="LAN-interface-on-GATEWAY"
INTERFACESv6=""
  1. iptables:
iptables -t nat -L POSTROUTING
iptables -L FORWARD
iptables -t nat -A POSTROUTING -o WAN-interface-on-GATEWAY -j MASQUERADE
iptables -A FORWARD -i LAN-interface-on-GATEWAY -o WAN-interface-on-GATEWAY -j ACCEPT

Firewall

  • sudo ~/bin/firewall.sh

LVM & RAID ("Administration Linux par la pratique T.1", pp. 337-365)

LVM

  • sudo fdisk -l /dev/sda
  • sudo pvs
  • sudo vgs
  • sudo lvs
  • lsblk
  • sudo cfdisk /dev/sdk, 8e
  • sudo pvcreate /dev/sdb1, sudo pvs
  • sudo vgextend vg0 /dev/sdb1, sudo pvs, sudo vgs
  • sudo lextend -l +100%FREE /dev/mapper/vg0-root, sudo lvs
  • sudo resize2fs /dev/mapper/vg0-root, df -h

RAID

  • cat /proc/mdstat
  • sudo mdadm --detail /dev/md/root, boot, swap
  • sudo mdadm --fail
  • sudo mdadm --manage /dev/md125 --add /dev/sdb3
  • sudo if=/dev/urandom of=/dev/sdb bs=512 count=5000000, sudo fdisk -l /dev/sdb
  • # sfdisk -d /dev/sda | sfdisk /dev/sdb
  • # mdadm --manage /dev/md125 --add /dev/sdb3, # watch cat /proc/mdstat

Grub

  • sudo grub2-mkconfig -o /boot/grub2/grub.cfg
  • grep limit /etc/yum.conf, rpm -qa | grep kernel, sudo package-cleanup --oldkernels --count=1

VPN

  • sudo cp file.opvn /etc/openvpn/client.conf
  • remote vpnaddr1, remote vpnaddr2, remote-random
  • auth-user-path /etc/openvpn/pass, login/npwd
  • curl ifconfig.co, sudo openvpn --config /etc/openvpn/client.conf --daemon, curl ifconfig.co
  • git clone https://aur.archlinux.org/openvpn-update-resolv-conf-git.git

Swap

  • sudo e /etc/sysctl.d/99-sysctl.conf, vm.swappiness=5, vm.vfs_cache_pressure=50

Logs

  • journalctl --disk-usage
  • journalctl --vacuum-time=2d, journalctl --vacuum-size=100M
  • se /etc/systemd/journald.conf, MaxFileSec=1month , SystemMaxUse=200M

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