A stack of 4 of these boards needs to be build, and I opted to use a laser cut acrylic plate (had some left) and some M2 and M3 nylon spacers for the job. Below is the progression from circuitboard scan, to final cut plate. SVG files for laser cutters are here<\/a> and here<\/a>.<\/p>\n The boards were equiped with a 16GB UHCI SD card for the OS and a 8GB USB2 flash drive for swap space. The stack was wired with a 5-port switch to the LAN and a 4-port charge station supplied power.<\/p>\n The final stack looked like this:<\/p>\n Added also a smallish (aka cheap) SSD for good measures; mostly to see if the performance is any better than the SD card or USB (of course it is).<\/p>\n The OS installed was armbian<\/a> (latest Debian version is fine, since I did not care about the missing accelerated graphics support), the database was a self-compiled MongoDB3.0 (vs. the stock 2.4), and rockmongo was used as web based UI for the database.<\/p>\n … under $200 \ud83d\ude42<\/p>\n + $26 for the SSD (cables I had laying around)<\/p>\n – local network is DHCP based and 192.168.1.x – boot and wait<\/p>\n – log into initial user using ssh (or putty) – edit hostname and set it to cluster[#]<\/p>\n # install preferred editor, here: joe joe \/etc\/hostname joe \/etc\/hosts joe \/etc\/network\/interfaces – Add user<\/p>\n adduser aschiffler – Initial kernel upgrade: – Prep swap<\/p>\n # Swap on SD card (file) # Swap on USB drive (primary partition, type 82) – Activate changes<\/p>\n reboot<\/p>\n – Install default MongoDB (2.4)<\/p>\n apt-get -y install mongodb mongodb-server<\/p>\n – switch to custom version of MongoDB (3.0, see below<\/strong> on how to compile the new version)<\/p>\n #\/root\/mongodb\/bin\/mongo \/etc\/init.d\/mongodb stop<\/p>\n cp \/usr\/bin\/mongo \/usr\/bin\/mongo.orig mv \/var\/lib\/mongodb \/var\/lib\/mongodb.orig<\/p>\n cp -f \/root\/mongodb\/bin\/mongo \/usr\/bin\/mongo mkdir \/var\/lib\/mongodb \/etc\/init.d\/mongodb start<\/p>\n – Add a user to MonoDB<\/p>\n joe \/etc\/mongodb.conf \/etc\/init.d\/mongodb restart<\/p>\n mongo<\/p>\n # Mongo 2.4 (old, see also https:\/\/docs.mongodb.org\/v2.4\/tutorial\/add-user-to-database\/<\/a>) # Mongo 3.0 joe \/etc\/mongodb.conf \/etc\/init.d\/mongodb restart<\/p>\n – Install rockmongo (cluster1)<\/p>\n apt-get install apache2 php5 php-pear<\/p>\n apt-get install php5-mongo joe \/var\/www\/html\/rockmongo\/config.php – configure firewall and bind<\/p>\n joe \/etc\/rc.local . \/etc\/rc.local<\/p>\n joe \/etc\/mongodb.conf \/etc\/init.d\/mongodb restart<\/p>\n – prepare replication<\/p>\n cp \/etc\/mongodb.conf \/etc\/mongodb.conf.orig systemLog: \/etc\/init.d\/mongodb restart<\/p>\n – enable replication<\/p>\n mongo cluster1\/admin -u aschiffler \u2013p ***EDITME*** –authenticationMechanism MONGODB-CR<\/p>\n rs.initiate() rs.add(“cluster2”) These steps are based on the steps provided on: – login as user<\/p>\n sudo bash<\/p>\n # — ensure we have 4G+ swap<\/p>\n apt-get -y install build-essential libssl-dev git scons libboost-filesystem-dev libboost-program-options-dev libboost-system-dev libboost-thread-dev<\/p>\n cd – patch data_view.h<\/p>\n cd ~\/build_mongodb\/mongo and add – patch SConscript<\/p>\n cd ~\/build_mongodb\/mongo\/src\/third_party\/v8-3.25\/ – patch boost<\/p>\n cd ~\/build_mongodb\/mongo\/src\/third_party\/boost\/boost\/smart_ptr\/detail\/ – update linux_syscall_support<\/p>\n![\"pcDunioMount\"](\"http:\/\/www.ferzkopp.org\/wordpress\/wp-content\/uploads\/2016\/01\/pcDunioMount_thumb.png\" "\\"pcDunioMount\\"")
<\/a><\/p>\n![\"XmasProject\"](\"http:\/\/www.ferzkopp.org\/wordpress\/wp-content\/uploads\/2016\/01\/XmasProject_thumb.jpg\" "\\"XmasProject\\"")
<\/a><\/p>\nUpdate (1\/6\/2015)<\/h6>\n
![\"SSDInCluster\"](\"http:\/\/www.ferzkopp.net\/wordpress\/wp-content\/uploads\/2016\/01\/SSDInCluster_thumb.png\" "\\"SSDInCluster\\"")
<\/a><\/p>\nSoftware<\/h6>\n
![\"image\"](\"http:\/\/www.ferzkopp.org\/wordpress\/wp-content\/uploads\/2016\/01\/image_thumb.png\" "\\"image\\"")
<\/a><\/p>\nBOM<\/h4>\n
![\"image\"](\"http:\/\/www.ferzkopp.org\/wordpress\/wp-content\/uploads\/2016\/01\/image_thumb-1.png\" "\\"image\\"")
<\/a><\/p>\nInstallation Steps<\/h4>\n
– download and flash Armbian_4.5_Pcduino3nano_Debian_jessie_4.2.3 to SD card using win32diskimager-v0.7-binary<\/p>\n
root\/1234<\/p>\n
apt-get -y install joe<\/p>\n
cluster[#]<\/p>\n
127.0.0.1 localhost cluster[#]
::1 localhost cluster[#] ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters
192.168.1.11 cluster1
192.168.1.12 cluster2
192.168.1.13 cluster3
192.168.1.14 cluster4<\/p>\n
iface eth0 inet static
address 192.168.1.1[#]
netmask 255.255.255.0
gateway 192.168.1.1<\/p>\n
usermod -aG sudo aschiffler<\/p>\n
apt-get -y update
apt-get -y upgrade<\/p>\n
#dd if=\/dev\/zero of=\/swapfile4G bs=4096 count=1024000
#mkswap \/swapfile4G
#chmod 0600 \/swapfile4G
#swapon \/swapfile4G<\/p>\n
fdisk \/dev\/sda
# optional slow wipe: dd if=\/dev\/zero of=\/dev\/sda1
mkswap \/dev\/sda1
swapon \/dev\/sda1 # add to startup \/etc\/rc.local<\/p>\n
#\/root\/mongodb\/bin\/mongod
#\/root\/mongodb\/bin\/mongoperf
#\/root\/mongodb\/bin\/mongos
# from
#\/usr\/bin\/mongo
#\/usr\/bin\/mongod
#\/usr\/bin\/mongoperf
#\/usr\/bin\/mongos<\/p>\n
cp \/usr\/bin\/mongod \/usr\/bin\/mongod.orig
cp \/usr\/bin\/mongoperf \/usr\/bin\/mongoperf.orig
cp \/usr\/bin\/mongos \/usr\/bin\/mongos.orig<\/p>\n
cp -f \/root\/mongodb\/bin\/mongod \/usr\/bin\/mongod
cp -f \/root\/mongodb\/bin\/mongoperf \/usr\/bin\/mongoperf
cp -f \/root\/mongodb\/bin\/mongos \/usr\/bin\/mongos<\/p>\n
chown mongodb.mongodb \/var\/lib\/mongodb<\/p>\n
auth = false<\/p>\n
#use admin
#db.system.users.remove(
# { user:”aschiffler” }
#)
#db.addUser( { user:”aschiffler”, pwd:”***EDITME***”, roles: [ ‘clusterAdmin’, ‘userAdminAnyDatabase’, ‘readAnyDatabase’ ] } )
#db.system.users.find()
#exit<\/p>\n
use admin
db.system.version.remove({ “_id” : “authSchema” })
db.system.version.insert({ “_id” : “authSchema”, “currentVersion” : 3 })
db.system.users.remove({ user:”aschiffler” })
db.createUser( { user:”aschiffler”, pwd:”***EDITME***”, roles: [ ‘clusterAdmin’, ‘userAdminAnyDatabase’, ‘readAnyDatabase’ ] } )
db.system.users.find()
exit<\/p>\n
auth = true<\/p>\n
cd \/var\/www\/html
tar xvf ~aschiffler\/rockmongo-1.1.7.tar
ln -s rockmongo-1.1.7 rockmongo
\/etc\/init.d\/apache2 restart<\/p>\n
$MONGO[“servers”][$i][“mongo_name”] = “cluster1”;\/\/mongo server name
$MONGO[“servers”][$i][“mongo_host”] = “cluster1”;\/\/mongo host
$MONGO[“servers”][$i][“mongo_port”] = “27017”;\/\/mongo port
$MONGO[“servers”][$i][“mongo_timeout”] = 0;\/\/mongo connection timeout
$MONGO[“servers”][$i][“mongo_auth”] = true;<\/p>\n
iptables -A INPUT -s 192.168.1.0\/24 -p tcp –destination-port 27017 -m state –state NEW,ESTABLISHED -j ACCEPT
iptables -A OUTPUT -d 192.168.1.0\/24 -p tcp –source-port 27017 -m state –state ESTABLISHED -j ACCEPT<\/p>\n
bind_ip = 0.0.0.0<\/p>\n
joe \/etc\/mongodb.conf<\/p>\n
destination: file
path: “\/var\/log\/mongodb\/mongodb.log”
logAppend: true
processManagement:
fork: false
net:
bindIp: 0.0.0.0
port: 27017
storage:
dbPath: “\/var\/lib\/mongodb”
journal:
enabled: false
engine: “mmapv1”
mmapv1:
smallFiles: true
replication:
replSetName: “rs1”
setParameter:
enableLocalhostAuthBypass: false<\/p>\n
rs.conf()<\/p>\n
rs.add(“cluster3”)
rs.add(“cluster4”)
rs.status()<\/p>\nMongoDB 3.0 on ARM<\/h4>\n
http:\/\/andyfelong.com\/2015\/12\/mongodb-3-0-7-on-raspberry-pi-2\/<\/a><\/p>\n
mkdir build_mongodb
cd build_mongodb\/
git clone git:\/\/github.com\/mongodb\/mongo.git
cd mongo
git checkout r3.0.8<\/strong><\/p>\n
joe src\/mongo\/base\/data_view.h<\/p>\n
#define MONGO_HAVE_STD_IS_TRIVIALLY_COPYABLE 0
or
#undef MONGO_HAVE_STD_IS_TRIVIALLY_COPYABLE<\/p>\n
# wget http:\/\/andyfelong.com\/wp-content\/uploads\/2015\/12\/SConscript<\/a>
wget https:\/\/gist.githubusercontent.com\/kitsook\/f0f53bc7acc468b6e94c\/raw\/93ebc8dc0adf7afb0a38c1b6bf702f8a8c6b70c2\/SConscript<\/a>
mv -f SConscript SConscript.old && mv -f SConscript.1 SConscript<\/p>\n
wget “https:\/\/svn.boost.org\/trac\/boost\/changeset\/77315?format=diff&new=77315″<\/a> -O patch.diff
patch <patch.diff<\/p>\n