How to configure vnc server in Linux (Cent OS7) server to access from windows and Linux machines.
I have tried with Tiger VNC but its not working every time after reboot the system. Please suggest other than Tiger VNC.
Given are the steps to install and configure VNC server in centOs:
~]# yum install tigervnc-server
~]# cp /usr/lib/systemd/system/vncserver#.service /etc/systemd/system/vncserver#:1.service
~]# vim /etc/systemd/system/vncserver#:1.service
replaced USER with riddhi in this file
ExecStart=/usr/sbin/runuser -l USER -c "/usr/bin/vncserver %i -geometry 1280x1024"
PIDFile=/home/USER/.vnc/%H%i.pid
~]# systemctl daemon-reload
~]# su - riddhi
~]$ vncpasswd //update password for user riddhi
~]# systemctl start vncserver#:1.service
~]# systemctl enable vncserver#:1.service
Now connect to centOs from Windows:
IP: ip address:5901
password : password of vncpasswd
Judging by your wording, it sounds like Tiger VNC is working just fine until you reboot. This is because the service is not set to start VNC automatically.
By following the guide found here (specifically step 3) you will have written your own .service file and all you need to do is run:
sudo systemctl enable whateveryoucalledyour.service
and it will start automatically every time the system is booted.
Related
what I did
sudo apt install lightdm
sudo reboot
sudo apt install x11vnc
sudo vi /lib/systemd/system/x11vnc.service
..
[Service]
Type=simple
ExecStart=/usr/bin/x11vnc -forever -display :0 -auth guess -passwd password
ExecStop=/usr/bin/killall x11vnc
Restart=on-failure
..
systemctl status x11vnc.service
the x11vnc.service is active running status now.
through port forwarding I open internal 5900 -> external 15900
and in putty, tunneling configuration, I added 5900 and public_ip:15900
then when I try to use in realvnc-viewer url, I typed localhost:0
and the system requires password for localhost:0
I tried tigervnc-viewer, it doesn't feel client viewer problem.
So I filled password to 'password'.
I tried so many times all failed with no password configured for vnc error.
Is there solution for this?
[Solved]
I didn't open ufw for 5900
I am using CentOS 7.3 as a guest VM from Oracle VirtualBox. The host is Windows 7 and I have a physical USB stick (aka flash drive) to house the data directory for Postgres. I can use a USB stick as a mounted directory in Linux. I can read and write files to it.
I expect to be able to have Postgres databases on my USB stick. But I cannot get Postgres databases on my USB stick. I installed Postgres on the Linux VM.
To change the default data directory of Postgres, I followed these directions.
If you do not have time to go to the link, I simply installed Postgres with these two commands:
yum -y install postgresql-server postgresql-contrib
postgresql-setup initdb
then I ran these two commands:
mv /var/lib/pgsql/data/* /mnt/windows-share/data
ln -s /mnt/windows-share /var/lib/pgsql/data
Afterward I try to start the Postgres service, I get an error.
Here is the command that I try (as root):
systemctl start postgresql
Here is the error:
Job for postgresql.service failed because the control process exited
with error code. See "systemctl status postgresql.service" and
"journalctl -xe" for detail.
I tried systemctl status postgresql.service and I found this:
Loaded: loaded (/usr/lib/systemd/system/postgresql.service; disabled
vendorpreset: disabled)
Active: failed (Result exit-code)... Process ...
ExecStartPre=/usr/bin/postgresql-check-db-dir ${PGDATA} (code=exited,
status=1/FAILURE)
... failed to start PostgreSQL... ...Unit postgresql.service...
...postgresql.service failed
I used journalctl -xe but that did not tell me anything meaningful.
To change the default data directory of Postgres, I tried this:
postgresql-setup initdb --pgdata=/mnt/windows-share/
But I got
failed to find PGDATA setting in --pgdata=/mnt/mar/data.service
How do I get Postgres installed with a customized data directory? I need it to be in a the "/mnt/" directory. I want to create all my databases on a USB stick.
To install Postgres on a customized location (e.g. home/postgres directory) follow these steps
install the required version of Postgres e.g. 13
create postgres directory in Home. and grant its access to posgres user
mkdir postgres
chown postgres:postgres postgres
usermod -m -d /home/postgres postgres
Move data directory to the new location as:
rsync -av /var/lib/pgsql/ /home/postgres/
update the location in postgres server as:
find / -name postgresql-9.5.service
vi /usr/lib/systemd/system/postgresql-9.5.service
update the data location in the file:
from the old location, e.g.
# Location of database directory
Environment=PGDATA=/var/lib/pgsql/13/data/
to the new location, e.g.
# Location of database directory
Environment=PGDATA=/home/postgres/13/data/"
Stop postgres, reload deamon and start postgres
stop postgres
systemctl daemon-reload
start postgres
Done...
I' ve solved the same problem on CentOS 6
Maybe u can try it.
Add your disk
Check your disk is existing (in my case new disk is /dev/sdb1/)
# fdisk -l
Mount new disk
# mkdir /hdd2
# mount -t ext3 /dev/sdb1 /hdd2/
Auto mount hard disk by add new line:
# vi /etc/fstab
Add line: /dev/sdb1 /hdd2 ext3 defaults 0 0
Config postgres
# service postgresql stop
# vi /etc/sysconfig/pgsql/postgresql
Add line: PGDATA=/hdd2/data
# service postgresql start
Hope it useful to you!!
Ubuntu 16.04.1 LTS
I have tried:
sudo update-rc.d -f postgresql remove
and
sudo vim /etc/postgresql/9.5/main/start.conf
then i change the word "auto" to "disabled"
Then i reboot the computer, and when it starts, i login and do:
sudo service --status-all | grep postgresql
Which returns:
[ + ] postgresql
So it is still starting when the server starts.
What is left for me to do? I don't want this service running when the computer starts, only when i manually start it with:
sudo service postgresql start
Use systemctl command to manage postgresql service:
stop service:
systemctl stop postgresql
start service:
systemctl start postgresql
show status of service:
systemctl status postgresql
disable service(not auto-start any more)
systemctl disable postgresql
enable service postgresql(auto-start)
systemctl enable postgresql
Ok. it's fixed thanks to Koen De Groote.
I did:
echo manual | sudo tee /etc/init/postgresql.override
and
sudo systemctl disable postgresql.service
and
sudo systemctl disable postgresql
....I don't know which one of them did it, but its not starting any more... Thank you...
I have a service that I want to start with system startup. I have built a ap#.service definition for it as a template, because there could be many instances.
Defined in the root systemd, this works well, and starts and stops the service with the system. The service instance is installed with systemctl enable ap#inst1 as would be expected. Root is also able to start and stop the service without problems. The service runs in its own account (myuser), not root, controlled by User=myuser in the ap#.service template.
But I want user 'myuser' to be able to start and stop their own service, without compromising system security.
I switched to using a user systemd, and enabled lingering with loginctl enable-linger myuser. I then enable the service defined in the ~myuser/.config/systemd/user directory. The service now starts and stops cleanly with the system, as designed. If I log in to a terminal as 'myuser', systemctl --user start ap#inst1, and systemctl --user stop ap#inst1 both work perfectly.
However, if I log in as a different user (user2) and perform sudo su - myuser in a terminal, then systemctl --user commands now fail with error message "Failed to get D-Bus connection: no such file or directory".
How do I enable systemctl --user to work after a sudo su - myuser command to switch the user?
I found the answer on another site with further searches using different terms.
The solutions needed was to provide the shell with information to reach the correct DBUS for the user.
By adding the following environment variables to the shell before running systemctl --user, the DBUS problem is eliminated, and systemctl operates correctly.
export XDG_RUNTIME_DIR="/run/user/$UID"
export DBUS_SESSION_BUS_ADDRESS="unix:path=${XDG_RUNTIME_DIR}/bus"
To ensure that the DBUS_SESSION_BUS_ADDRESS is available in the sudo shell, I added the environment variables to ~/.bash_profile of the target userid. This requires that a login shell ( sudo su - myuser or sudo -l myuser) is created in order to create the correct environment.
Alternatively, add the creation of the environment variables to ~/.bashrc (or equivalent for other shells). The environment will then be established anew for all shell creations.
systemd 248 (released March 2021) introduced support for the syntax -M myuser# for specifying another user.
$ sudo systemctl --user -M myuser# start ap#inst1
A side-note:
If you want to get an interactive login shell for the user myuser
$ sudo machinectl shell myuser#
I was trying to configure a static IP address on my Linux machine (Fedora 19 ). However when I was trying to restart my network.services using systemctl restart network.service, I was unable to do so.
[root#xyz network-scripts]# systemctl restart network.service
Job failed. See system journal and 'systemctl status' for details.
I tried to reboot my system and re execute the command, but still I am getting the same error. Also I am enable to access internet on my system.
Can anyone help me out with this.
To restart network services, you can use this command
service networking restart
You can also use
service networking stop
then
service networking start
restart the nm-applet with this command from terminal:
killall nm-applet; nohup nm-applet &
or restart the the network manager service using:
sudo systemctl restart network-manager
Restore radio frequencies by running the following command;
sudo service NetworkManager restart
If that does not work, run this one;
rfkill unblock wifi