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linux:prepare:prepare [2018/12/05 08:25] – niziaklinux:prepare:prepare [2025/01/06 10:53] (current) – niziak
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-====== Linux/Prepare ======+====== Linux: Prepare ======
  
 ===== Basic ===== ===== Basic =====
 +
 +==== .bashrc ====
 +
 +Adapt old ''.bashrc'' to latest distro ''/etc/skel/.bashrc'' 
 +
 +==== default EDITOR ====
 +<code bash>
 +sudo update-alternatives --list editor
 +sudo update-alternatives --config editor
 +</code>
  
 ==== set umask ==== ==== set umask ====
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   * ''umask 007'' RW for user, RW for group   * ''umask 007'' RW for user, RW for group
  
 +**NOTE!:** Problem appears with non default user umask and ''sudo'' command usage.
 +After sudo umask is still set to the user umask, which is correct. 
 +But can lead to some unpredicted behavior i.e. installing system-wide packages - new file will be created with incorrect umasks (user umask).
  
-==== add i386 architecture ====+To prevent this: 
 +<file | /etc/sudoers> 
 +Defaults        umask_override 
 +Defaults        umask=0022 
 +</file>
  
-<code bash> 
-dpkg --add-architecture i386 
-apt-get update 
-apt-get install gpm tcpdump bmon tinc ppp pptpd mc links2 gparted hdparm smartmontools smart-notifier valgrind openssh-server 
-apt-get install wireshark mtr 
-</code> 
  
 ==== NTP: allow time corrections bigger than 1h ==== ==== NTP: allow time corrections bigger than 1h ====
-  - Edit /etc/default/ntp and add "-s" argument. +  - Disable systemd time service: ''systemctl disable --now systemd-timesyncd'' 
-  - Ordered List ItemInstall ntpdate and ntp +  - Install ''ntpdate'' and ''ntp'' 
-  - Ordered List ItemSwitch RTC to UTC time:+  - Edit ''/etc/default/ntp'' and add ''-g'' argument.  
 +  - Switch RTC to UTC time:
 <code bash> <code bash>
 timedatectl set-local-rtc 0 timedatectl set-local-rtc 0
-ntpd -qg+ntpd -gxn
 hwclock --systohc hwclock --systohc
 </code> </code>
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- +Remember to set [[sw:libreoffice#paper_format]]
- +
-==== set cfq/deadline scheduler ==== +
- +
-<file | /etc/udev/rules.d/60-schedulers.rules> +
-ACTION=="add|change", KERNEL=="sd[a-z]", ATTR{queue/rotational}=="1", ATTR{queue/scheduler}="cfq" +
-ACTION=="add|change", KERNEL=="sd[a-z]", ATTR{queue/rotational}=="0", ATTR{queue/scheduler}="deadline"   +
-</file> +
- +
-<code bash>cat /sys/block/sd*/queue/scheduler</code> +
- +
-=== single queue schedulers === +
-There are 2 queues, one for read & one for write operations. +
-  * **none** is just a First In First Out standard queue of I/O operations. +
-  * **cfq** (Completely Fair Scheduling) is similar to the Round Robin algorithm and basically allots a fixed execution time for each I/O operation (they are implemented as a circular queue) +
-  * **deadline** is like a priority queue with an aging concept. Basically it adds a deadline for each I/O operation & implements a priority queue +
- +
-=== block multi-queue schedulers === +
-Supported in kernel >=4.12. It is disabled by default. +
-To use multi-queue schedulers compile kernel with **CONFIG_SCSI_MQ_DEFAULT=y** or pass parameter **scsi_mod.use_blk_mq=1** in boot loader. +
- +
-[[https://www.thomas-krenn.com/en/wiki/Linux_Multi-Queue_Block_IO_Queueing_Mechanism_(blk-mq)|Linux Multi-Queue Block IO Queueing Mechanism]] +
- +
-<file | /etc/udev/rules.d/60-schedulers.rules> +
-ACTION=="add|change", KERNEL=="sd[a-z]", ATTR{queue/rotational}=="1", ATTR{queue/scheduler}="bfq" +
-ACTION=="add|change", KERNEL=="sd[a-z]", ATTR{queue/rotational}=="0", ATTR{queue/scheduler}="mq-deadline" +
-</file> +
-<code bash> +
-sudo udevadm control --reload +
-sudo udevadm trigger +
-cat /sys/block/sd*/queue/scheduler +
-</code>+
  
 ==== Disable console beep ==== ==== Disable console beep ====
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 </code> </code>
  
-==== Logitech wireless mouse/trackball ==== 
-To handle old (not Unifying Receiver) Logitech product: 
-<code bash>sudo apt-get install lomoco</code> 
-<code bash>sudo lomoco -i</code> 
-<code> 
-003.005: 046d:c508 Receiver for Cordless Optical TrackMan (C-BA4-MSE) Caps: CSR SMS  
- Receiver type: C508 
- Mouse type: Cordless Optical TrackMan 
- Connect button on mouse pressed: no 
- Active RF Channel: 1 
- Battery status: 7 (full) 
- Cordless security ID: 0x8e16 
- Receiver talking: yes 
- Lock Request (CONNECT button pressed): no 
- Mouse Powerup (First time out of the box auto-locking): no 
- Receiver Unlocked (Mouse disconnected): no 
- Wait Lock (Searching for mouse): no 
- Device physical shape type: 0 
- SmartScroll (SMS): reporting not supported 
- USB Mouse Polling Interval:  10ms 
-</code> 
  
-<code bash>sudo lomoco --pid=C508 -i | grep -w "Battery status:"</code>+==== mandb ====
  
-For logitech devices there are additional packets: +Disable mandb updates after apt: 
-[[https://wiki.archlinux.org/index.php/Logitech_Marble_Mouse]]+<code bash>echo "set man-db/auto-update false" | debconf-communicate; dpkg-reconfigure man-db</code>
  
-=== Change trackball pointer speed === +==== smartmontools ====
-Using CTM: +
-<code bash> +
-xinput set-prop "Logitech USB Receiver" "libinput Accel Speed" 1 +
-xinput set-prop "Logitech USB Receiver" "Coordinate Transformation Matrix" \ +
-2.000000, 0.000000, 0.000000, \ +
-0.000000, 2.000000, 0.000000, \ +
-0.000000, 0.000000, 1.000000 +
-</code>+
  
 +<code bash>apt install smartmontools</code>
 +<file sh /etc/smartd.conf>
 +DEVICESCAN -n standby,336,q -S on -H -l error \
 + -l xerror \
 + -l selftest \
 + -l offlinests \
 + -l scterc,0,0 \
 + -e lookahead,on \
 + -s (L/../../6/01|S/../.././02) \
 + -f -p -C 197+ -U 198+ -W 10,45,50....
 +</file>
 +
 +NOTE: It ignores disk in standby to do not spin up HDDs, but it ignores 336 checks (x 1800s interval = 7 days), then it will spin up disc. To put disc sleep again it is good to use ''hd-idle'' daemon.
 +
 +==== hd-idle ====
 +
 +<code bash>apt install hd-idle</code>
 +
 +<file sh /etc/default/hd-idle>
 +HD_IDLE_OPTS="-a /dev/disk/by-id/ata-ST2000DM008-2UB102 -i 600 -l /var/log/hd-idle.log"
 +</file>
 +systemctl restart hd-idle