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2019/08/01

How do I run graphical programs remotely from a Linux server?

Filed under: Server,Ubuntu — Mathz @ 20:19

It is common for users of the Ubuntu Linux systems to want to run graphical applications (such as matlab, mathematica, eclipse, etc) on these Linux servers and display them on their local computers.  This document details the steps required to do this for Mac

Mac OS X

  1. Install XQuartz on your Mac, which is the official X server software for Mac
  2. Run Applications > Utilities > XQuartz.app
  3. Right click on the XQuartz icon in the dock and select Applications > Terminal.  This should bring up a new xterm terminal windows.

  4. In this xterm windows, ssh into the linux system of your choice using the -X argument (secure X11 forwarding).  For example, to log into hulk.soic.indiana.edu you would run something like:

         ssh -Y username@my.linux.host

  5. Once you are logged into the linux system, you can just run the GUI program of your choice (ie. matlab, mathematics, etc) and it will display on your Mac.

2019/07/03

Ubuntu 18.04 root DNS update

Filed under: Server,Ubuntu — Mathz @ 00:09
Såg detta i min log fil  
checkhints: b.root-servers.net/A (199.9.14.201) missing from hints 

Jag åtgärda det genom följande kommando

sudo wget --user=ftp --password=ftp ftp://ftp.rs.internic.net/domain/db.cache -O /etc/bind/db.root

2019/06/12

Disable SELinux Centos 7

Filed under: Centos,Server — Mathz @ 16:19

Temporery disable SELinux
sudo setenforce 0


/etc/selinux/config file and set the SELINUX mod to disabled


# This file controls the state of SELinux on the system.
# SELINUX= can take one of these three values:
# enforcing – SELinux security policy is enforced.
# permissive – SELinux prints warnings instead of enforcing.
# disabled – No SELinux policy is loaded.
SELINUX=disabled
# SELINUXTYPE= can take one of these two values:
# targeted – Targeted processes are protected,
# mls – Multi Level Security protection.
SELINUXTYPE=targeted

2019/02/15

How to move docker’s default /var/lib/docker to another directory on Ubuntu/Debian Linux

Filed under: Docker,Server — Mathz @ 11:00

The following config will guide you through a process of changing the docker’s default /var/lib/docker storage disk space to another directory. There are various reasons why you may want to change docker’s default directory from which the most obvious could be that ran out of disk space. The following guide should work for both Ubuntu and Debian Linux or any other systemd system. Make sure to follow this guide in the exact order of execution.

Let’s get started by modifying systemd’s docker start up script. Open file /lib/systemd/system/docker.service with your favorite text editor and replace the following line where /new/path/docker is a location of your new chosen docker directory:

FROM:
ExecStart=/usr/bin/docker daemon -H fd://
TO:
ExecStart=/usr/bin/docker daemon -g /new/path/docker -H fd://

When ready stop docker service:

# systemctl stop docker

It is important here that you have completely stopped docker daemon. The following linux commandwill yield no output only if docker service is stopped:

# ps aux | grep -i docker | grep -v grep

If no output has been produced by the above command, reload systemd daemon:

# systemctl daemon-reload

Once this is done create a new directory you specified above and optionally rsync current docker data to a new directory:

# mkdir /new/path/docker
# rsync -aqxP /var/lib/docker/ /new/path/docker

At this stage we can safely start docker daemon:

# systemctl start docker

Confirm that docker runs within a new data directory:

#  ps aux | grep -i docker | grep -v grep
root      2095  0.2  0.4 664472 36176 ?        Ssl  18:14   0:00 /usr/bin/docker daemon -g  /new/path/docker -H fd://
root      2100  0.0  0.1 360300 10444 ?        Ssl  18:14   0:00 docker-containerd -l /var/run/docker/libcontainerd/docker-containerd.sock --runtime docker-runc

All done.

2019/01/10

Centos – Give Tomcat access to Mysql/MariaDB

Filed under: Server — Mathz @ 14:48

To see all Tomcat options
getsebool -a | grep tomcat

To set Tomcat access to database
setsebool tomcat_can_network_connect_db 1

SELinux workaround

Give Tomcat network access.

Error message
Could not connect to address=(host=)(port=3306)(type=master) : Permission denied (connect failed)

Tomcat have no access to file system

ps -eZ | grep tomcat_t

yum install policycoreutils-python

semanage permissive -a tomcat_t

2018/11/26

Selinux – Permission denied on accessing host directory in docker

Filed under: Docker — Mathz @ 11:18

chcon -Rt svirt_sandbox_file_t /path/to/volume

2018/11/12

Elasticsearch commands

Filed under: Server — Mathz @ 14:21

curl localhost:9200/_cat/indices?v
curl -XGET ‘http://127.0.0.1:9200/wikidb/page/_search?q=wikidb’

2018/10/02

Vilmas API

Filed under: Server — Mathz @ 11:19

Det verkar som att Vilma ska släppa ett öppet API. Första steget är att publicera sina priser.
https://api.vimla.se/abroad

2018/08/30

Zoneminder in Docker

Filed under: Docker,Server — Mathz @ 17:15

docker swarm init
docker stack deploy -c docker-compose.yml zm
echo “wait for a few seconds to MySQL start for the first time”
docker service scale zm_web=1
echo “go to ZoneMinder console Options-Servers and declare node.0->stream0.localhost and node.1 … node.3, finally start”
docker service scale zm_stream=3
docker service ls

Good debug commands
sudo docker service ps zm_web
sudo docker service ls
sudo docker service rm

Boot Raspberry PI from iSCSI

Filed under: Server — Mathz @ 16:49

https://www.berryterminal.com/doku.php/berryboot

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