disable oracle-xe-21c service on Linux (Ubuntu) [closed] - linux

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I need to be able to start the oracle-xe-21c at will, and do not want it to start automatically at system boot.
The command:
sudo systemctl disable oracle-xe-21c
returns the following:
oracle-xe-21c.service is not a native service, redirecting to systemd-sysv-install.
Executing: /lib/systemd/systemd-sysv-install disable oracle-xe-21c
update-rc.d: error: oracle-xe-21c Default-Start contains no runlevels, aborting.
How can I disable automatic startup?. I am on Lubuntu 20.04.

Suggesting to remove oracle-xe-21c.service file from the service folder will disable the service.
sudo mv /etc/systemd/system/oracle-xe-21c.service /home/oracle

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Does systemctl daemon-reload need to be executed using root/sudo? [closed]

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Closed 12 months ago.
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Does systemctl daemon-reload need to be executed using root/sudo? and does the same command apply to both Centos 7 and Ubuntu 18.04.3 LTS?
$ systemctl daemon-reload
==== AUTHENTICATING FOR org.freedesktop.systemd1.reload-daemon ====
Authentication is required to reload the systemd state.
Authenticating as: neo
Password:
Yeah, I'd say so.
Unless you are doing it in a container with root privileges, pretty sure you need to have root permissions for anything related to systemd services.

Starting apache web server at every reboot cloud-init [closed]

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Closed 5 years ago.
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I am pretty new in the cloud-init. I got VM everything is setup and running and I designed the reboot mechanism in the VM to use when VM requires reboot after installing updates. So when I reboot the VM Apache is not working by itself after reboot until I run the start command. Is there a way to make Apache start after every reboot?
problem solved, after reading this two sites
apache-server-doesnt-start-automatically
starting_apache_web_server_at_every_reboot_for_debian_ubuntu_linux
I added this line:
cloud_config['runcmd'].append(['update-rc.d', 'apache2', 'enable'])

sshfs, linux - how to mount with read-only access [closed]

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Closed 6 years ago.
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I need to mount other server via sshfs with read-only mode. My OS is Linux (Ubuntu). Is it possible to do that?
My command used with that connection is:
sudo sshfs user#123.123.123.123:/home/user /media/mountpoint/ -o allow_other
After running that I have write-access. I need to have read-only. Please help.
just add one more option: sshfs user#123.123.123.123:/home/user /media/mountpoint/ -o allow_other -o ro .
this should help: http://ubuntuforums.org/showthread.php?t=975107

Updating on linux [closed]

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Closed 8 years ago.
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When I enter the command:
apt-get update
I get an error message telling me that it cant open the lock file. Can anyone explain why this causes a problem and how I can avoid it in the future?
cant open the lock file
You can 2 reasons of this problem:
you run apt-get update without administrative privileges. Use sudo or login as root.
in your system running another apt-get, aptitude, synaptic, Software Center or Update Manager. Close it ant try again.

Why use the service command in linux? [closed]

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Closed 7 years ago.
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What is the difference between
service apache2 restart
and
/etc/init.d/apache2 restart
So basically why is the service command recommended compared to directly invoking the appropriate command?
The service command runs the init scripts in a predictable environment:
service runs a System V init script in as predictable environment as possible, removing most environment variables and with current working directory set to /.
from: http://linux.die.net/man/8/service

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