Différences

Ci-dessous, les différences entre deux révisions de la page.

--- public:a_perfect_btrfs_server [2018/07/21 17:01] – [Add zram based swap] pcouderc
+++ public:a_perfect_btrfs_server [2021/11/19 08:56] (Version actuelle) – [Initialize LXD] pcouderc
@@ Ligne 40: / Ligne 40: @@
 </code>
-===== Update init system =====
+===== Various inits  =====
-... to allow boot in case of failure of one disk of the RAID1.
+I suggest to modify les logs dans /etc/systemd/journald.conf :
-Include 'degraded' option in GRUB_CMDLINE_LINUX in /etc/grub.d/10_linux  :
 <code>
-GRUB_CMDLINE_LINUX="rootflags=degraded,subvol=${rootsubvol} ${GRUB_CMDLINE_LINUX}"
+Storage=persistent
-</code>
-Then :
-<code>
-update-grub
-grub-install /dev/sda1
-grub-install /dev/sdb1
-</code>
-And too replace "default" options with "degraded,noatime,nodiratime,subvol=@" in btrfs line in /etc/fstab :
-<code>
-UUID=...   / btrfs   degraded,noatime,nodiratime,subvol=@   0  0
 </code>
+See : https://guillaume.fenollar.fr/blog/journald-tutoriel-journald-journalctl/
 ==== Add zram based swap ====
-Ubuntu policy is to assign half of the memory to swap and divide it by the the number of CPU hearts. This is done by zram-config which is not available in debian. I have choosen :
+Ubuntu policy is to assign half of the memory to swap and divide it by the the number of CPU hearts.
 <code>
-git  clone https://gitlab.com/jiab77/systemd-zram
+apt install zram-tools
-cd systemd-zram
-./install.sh
 </code>
-Here you can modify /etc/systemd/zram.conf from 33% to 50 for next reboot...
+You should  modify ALLOCATION to 33-50% or total RAM in /etc/default/zramswap
-apt install bc, in order to get /use/sbin/zramstat ok.
 ===== Install lxd =====
@@ Ligne 87: / Ligne 73: @@
 auto lo
 iface lo inet loopback
 # The primary network interface
+auto enps5s0
+iface enp5s0 inet manual
 auto br0
 iface br0 inet static
@@ Ligne 103: / Ligne 95: @@
 </code>
-==== Install lxd ====
+==== Install lxd from snap ====
-It is [[https://forum.snapcraft.io/t/disabling-automatic-refresh-for-snap-from-store/707/73|discussed]] whether installing lxd with snap is a good solution. Currently, I have choosen to [[https://github.com/lxc/lxd/|install from the sources]].
-=== From sources ===
-In your home directory (not root) :
-<code>
-cd ~
-apt install acl dnsmasq-base git golang liblxc1 lxc-dev libacl1-dev make pkg-config rsync squashfs-tools tar xz-utils
-mkdir -p ~/go
-export GOPATH=~/go
-go get -d -v github.com/lxc/lxd/lxd
-cd $GOPATH/src/github.com/lxc/lxd
-make
-cd $GOPATH/bin
-mv lxc /usr/local/bin
-mv lxc /usr/local/bin
-echo "root:1000000:65536" | sudo tee -a /etc/subuid /etc/subgid
-sudo -E /user/local/bin/lxd --group sudo
-</code>
-Then initialize lxd below.
-=== with snap ===
-All this can be simplified installing lxd via snap:
 <code>
@@ Ligne 151: / Ligne 118: @@
 <code>
 lxc launch images:debian/stretch debian
+lxc config device  override debian eth0 hwaddr=02:1E:62:00:00:36 (recommended)
+lxc config set  debian  volatile.eth0.hwaddr  00:1e:62:00:00:43 (not recommended)
 lxc start debian
 lxc exec  debian bash
@@ Ligne 157: / Ligne 127: @@
 It is possible to choose to work as root in the containers as they are isolated from the host.
-Without snap, to keep lxd permanent, I did reboot and create
+====  Containers LXD ====
- a /etc/systemd/system/lxd.service :
+=== Backup ===
+<code>
+lxc export pgsql /media/lxd_containers/pgsql2020_01_12.tar.gz
+</code>
+After import, the container is on stopped state :
 <code>
-[Unit]
+lxc import  /media/lxd_containers/pgsql2020_01_12.tar.gz
-Description=LXD - main daemon
+</code>
-After=lxcfs.service
-Requires=lxcfs.service
-[Service]
+=== Use simple mail in server or containers ===
-EnvironmentFile=-/etc/environment
+== nullmailler ==
-ExecStartPre=/usr/lib/x86_64-linux-gnu/lxc/lxc-apparmor-load
+Bien
-ExecStart=/usr/local/bin/lxd --group sudo   --logfile=/var/log/lxd/lxd.log
+== msmtp ==
-ExecStartPost=/usr/local/bin/lxd waitready --timeout=600
-KillMode=process
-TimeoutStartSec=600s
-TimeoutStopSec=30s
-Restart=on-failure
-LimitNOFILE=1048576
-LimitNPROC=infinity
-TasksMax=infinity
-[Install]
+<code>
-WantedBy=multi-user.target
+apt install msmtp msmtp-mta
-Alias=lxd.service
+</code>
+Et /etc/msmtprc :
+<code>
+account default
+host 192.168.13.36
+auto_from off
+from container_name@couderc.eu
+syslog LOG_MAIL
 </code>
-This service must be started.
+== Data access ==
+<code>
+/var/snap/lxd/common/mntns/var/snap/lxd/common/lxd/storage-pools/default/containers/
+</code>
+===== Maintenance =====
+In case of failure, prevent the problem by having a 3rd empty disk ready...
+To replace :
+<code>
+btrfs fi show
+btrfs replace start -rf /dev/sdb2 /dev/sda2 /
+</code>