Although Apple doesn’t have too many apps that support Linux admins, here is one that just came back on the market with a rebound on 26 Oct. 2016 with a new look, features and bug fixes: The iStat3 Server for Linux and iStat3 for iOS made by Bjango PTY Ltd. This app will display live the following characteristics of a Linux server.
– Uptime
– CPU usage
– System Load
– Disk space and disk activity
– Network traffic load
– Processes list(top)
– Sensors: Memory and CPU temperature

Read more about it on //

In order for the iOS app to get this information from the Linux servers, it needs a connection to its colleague the iStat3 server, which is an agent running in each targeted Linux server. The agent is a daemon which runs in the background and listens on a standard port 5109(configurable). Since there are so many different Linux distributions the agent needs to be compiled in each targeted Linux server. In order to facilitate this process I wrote this article.

Note: I only mention the steps for Debian 6/7/8 and Ubuntu 12.x/14.x/16.x


Installing the needed packages:
apt-get update && apt-get install build-essential g++ autoconf libxml2-dev libssl-dev libsqlite3-dev fancontrol libsensors4:amd64 libsensors4-dev lm-sensors libssl1.0-dev
Download the software:
wget -O istatserver-linux_3.02.tar.gz
or if changed address or not available
Compiling and installing the software:
tar fvxz istatserver-linux_3.02.tar.gz
cd istatserver-3.02
./configure && make && make install

Configuring the istatserver:
Here you mostly need to modify the 5 digit server_code.
vim /usr/local/etc/istatserver/istatserver.conf

Extra preparations for Debian 6/7 or Ubuntu 12.x/14.x which are using the SysV init

Getting the start script from my repos:
wget // -O /etc/init.d/istatserver
chmod 755 /etc/init.d/istatserver
update-rc.d istatserver defaults
service istatserver start ; sleep 1 ; ps aux | grep -v grep | grep istat

Result should be:
istat 17891 0.0 0.2 42108 2332 ? R 18:39 0:00 /usr/local/bin/istatserver -d

Extra preparations for Debian 8 or Ubuntu 16.x which are using the Systemd init

vim /etc/systemd/system/istatserver.service
istatserver.service file content:
Description=istatserver server daemon
ExecStart=/usr/local/bin/istatserver $OPTIONS
ExecReload=/bin/kill -HUP $MAINPID

Make sure the environment file exists, even if it’s empty, otherwise the service will not want to start!!
touch /etc/default/istatserver
systemctl daemon-reload
systemctl enable istatserver.service
service istatserver start ; sleep 1 ; ps aux | grep -v grep | grep istat

Result should be:
istat 1507 43.0 0.0 118844 7120 ? Ssl 19:02 0:00 /usr/local/bin/istatserver

General Note:

Makes sure your firewall is allowing in the port 5109(or whatever the port you are using).
I’m using ufw, so for example the command would be:
ufw allow from any to any port 5109
Rule added
Rule added (v6)


In case you had already the older version of this agent(istatd) running here are the steps to stop using it:
ps aux | grep istat
killall istatd ; sleep 2 ; killall istatd
update-rc.d -f istatd remove

Getting the iPad/iPhone APP:

Concerning the iOS app, you need to buy it on Apple store and its name is: iStat 3 from Bjango PTY Ltd.
This app allows to monitor multiple Linux servers with very pretty graphs.
If you have a Mac you can also buy the similar APP called iStat from Apple Store. It displays the exact same thing as with iPad and adds a few small extra features.

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