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--- nas_on_debian [2017/08/13 04:58] – herwarth
+++ nas_on_debian [2017/08/15 18:08] (current) – herwarth
@@ Line 132: / Line 132: @@
   systemctl daemon-reload
   systemctl enable network-wait-online
+====Tuning====
+===Swappiness===
+<code - /etc/sysctl.d/10-local.conf>
+vm.swappiness=1
+</code>
+===SSD kernel scheduler===
+<code - /etc/udev/rules.d/60-ssd-scheduler.rules>
+# set deadline scheduler for non-rotating disks
+ACTION=="add|change", KERNEL=="sd[a-z]", ATTR{queue/rotational}=="0", ATTR{queue/scheduler}="deadline"
+</code>
 ====S.M.A.R.T monitoring====
   apt install smartmontools
 TODO: monitoring config with smartd and cron
+====Python and PIP====
+  update-alternatives --list python
+  update-alternatives: error: no alternatives for python
+  update-alternatives --install /usr/bin/python python /usr/bin/python2.7 1
+  update-alternatives: using /usr/bin/python2.7 to provide /usr/bin/python (python) in auto mode
+  update-alternatives --install /usr/bin/python python /usr/bin/python3.5 2
+  update-alternatives: using /usr/bin/python3.5 to provide /usr/bin/python (python) in auto mode
+  apt install python3-pip python-pip
+Now we can switch using the update-alternatives --config python. Remember pip for python 3 is pip3. pip is for python 2.7
+=====Bcache=====
+Gather which disks are HDD and which are SDD.In my case:
+  - sda: SSD (256GB)
+  - sdb: HDD (4TB)
+  - sdc: HDD (4TB)
+  - sdd: SSD (120GB root disk)
+  - sde: SSD (256GB)
+  - sdf: HDD (4TB)
+  - sdg: HDD (4TB)
+====Create Linux RAID====
+I am going to create a RAID-1 mirror MD on the SSDs so I can enable writeback caching.
+  mdadm --create /dev/md0 --assume-clean --level=1 --raid-devices=2 /dev/sda /dev/sde
+I am going to create a RAID-10 MD on the HDDs.
+  mdadm --create /dev/md1 --level=10 --raid-devices=4 /dev/sdb /dev/sdf /dev/sdc /dev/sdg
+When rebooting the system md0 and 1 became md126 and md127. Also after rebooting the MD devices became read-only and pending sync. To enable de devices read-write:
+  mdadm --readwrite /dev/md126
+  mdadm --readwrite /dev/md127
+====Bcache configuration====
+  apt install bcache-tools
+In my case after a reboot /dev/md127 was the RAID-1 SSD mirror and /dev/md126 the RAID-10 HDD.
+  make-bcache --discard --writeback -C /dev/md127
+  make-bcache -B /dev/md126
+We want to use UUIDs to avoid possible strange bootup behavior.
+  bcache-super-show /dev/md127 | grep cset.uuid
+  cset.uuid		f8d82c5e-a9a2-4b99-a2b0-15feab250372
+Attach the SSD cache to the bcache0 device
+  echo f8d82c5e-a9a2-4b99-a2b0-15feab250372 > /sys/block/bcache0/bcache/attach
+Enable writeback cache
+  echo writeback > /sys/block/bcache0/bcache/cache_mode
+Show the status
+  cat /sys/block/bcache0/bcache/cache_mode
+  cat /sys/block/bcache0/bcache/state
+====Bcache helpful commands====
+===Enable writeback cache===
+  echo writeback > /sys/block/bcache0/bcache/cache_mode
+===Show the status===
+  cat /sys/block/bcache0/bcache/cache_mode
+  cat /sys/block/bcache0/bcache/state
+===Remove cache from bcache0===
+<code>
+ls -l /sys/fs/bcache/
+total 0
+drwxr-xr-x 7 root root    0 Aug 12 21:28 af7bbe93-7bb8-4789-b879-a033c1331223
+--w------- 1 root root 4096 Aug 12 21:25 register
+--w------- 1 root root 4096 Aug 12 21:25 register_quiet
+</code>
+  echo af7bbe93-7bb8-4789-b879-a033c1331223 > /sys/block/bcache0/bcache/detach
+Wait for the cache status to become no cache. When attached the cache is dirty
+  watch -n 10 cat /sys/block/bcache0/bcache/state
+===Remove bcache0 device===
+  echo 1 > /sys/block/md126/bcache/stop #HDD backing
+  echo 1 > /sys/block/md127/bcache/set/stop #SSD cache
+  echo 1 > /sys/block/bcache0/bcache/stop
 =====Samba=====
@@ Line 154: / Line 230: @@
 	load printers = No
 	printcap name = cups
+	max xmit = 32768
+	min receivefile size = 2048
 	server min protocol = NT1
 	passdb backend = ldapsam:ldap://ldap.mngt.bh.helux.nl
 	security = USER
 	server role = standalone server
+	deadtime = 15
+	socket options = IPTOS_LOWDELAY SO_RCVBUF=131072 SO_SNDBUF=131072 TCP_NODELAY
 	winbind enum groups = Yes
 	winbind enum users = Yes
@@ Line 166: / Line 246: @@
 	create mask = 0640
 	directory mask = 0750
+	aio read size = 2048
+	aio write size = 2048
+	use sendfile = Yes
+	write cache size = 1024000
@@ Line 176: / Line 260: @@
 [share]
 	path = /volume1/share
+	force create mode = 0644
+	force directory mode = 0755
 	read only = No
 	valid users = %U
 </code>
+  smbpaswd -W
+Enter the LDAP manager password
+===mDNS===
+  apt install avahi-daemon avahi-utils
+<code - /etc/avahi/services/smb.service>
+<?xml version="1.0" standalone='no'?>
+<!DOCTYPE service-group SYSTEM "avahi-service.dtd">
+<service-group>
+ <name replace-wildcards="yes">%h</name>
+ <service>
+   <type>_smb._tcp</type>
+   <port>445</port>
+ </service>
+ <service>
+   <type>_device-info._tcp</type>
+   <port>0</port>
+   <txt-record>model=RackMac</txt-record>
+ </service>
+</service-group>
+</code>
+Avahi daemon should start after samba
+  cp /lib/systemd/system/avahi.daemon.service /etc/systemd/system
+<code - /etc/systemd/system/avahi-daemon.service>
+[Unit]
+.
+.
+Description=Avahi mDNS/DNS-SD Stack
+Requires=avahi-daemon.socket
+After=smbd.service
+.
+.
+</code>
+  systemctl daemon-reload
+  systemctl enable avahi-daemon
+=====Docker=====
+Add the Docker CE repo and install from there
+  apt install apt-transport-https ca-certificates curl gnupg2 software-properties-common
+  curl -fsSL https://download.docker.com/linux/debian/gpg | apt-key add -
+  add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/debian $(lsb_release -cs) stable"
+  apt install docker-ce
+For Kolla
+  mkdir -p /etc/systemd/system/docker.service.d
+<code>
+tee /etc/systemd/system/docker.service.d/kolla.conf <<-'EOF'
+[Service]
+MountFlags=shared
+EOF
+</code>
+  systemctl daemon-reload
+  systemctl restart docker
+  echo configfs >/etc/modules-load.d/configfs.conf
+  systemctl status sys-kernel-config.mount
 {{tag>linux}}

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