fedora

Just some notes for setting up a new OS to develop projects on GNU/Linux Fedora

 in Applications / GNU/Linux  tagged clion / fedora / git / inotify / intellij / jetbrains / libtalloc / sysctl / talloc by

If the project is in C++ and uses mysql then install

sudo dnf install mysql++-devel;

If the project is in C/C++ and you are missing talloc.h install

sudo dnf install libtalloc-devel;

Set your name and email for all git projects

git config --global --edit
Then fill-in the configuration file similar to below
# This is Git's per-user configuration file.
[user]
# Please adapt and uncomment the following lines:
#       name = Michael, George
#       email = [email protected]
[user]
        name = Michael, George
        email = [email protected]
[gui]
        editor = gedit

or use these individual commands to set the configuration

[george@fedora ~]$ git config --global user.name "Michael, George"
[george@fedora ~]$ git config --global user.email "[email protected]"

Increase amount of inotify watchers

If you are using CLion or IntelliJ IDEA by jetbrains increase the amount of inotify watchers.
CLion, IntelliJ (and other tools of jetbrains) use inotify on GNU/Linux to monitor directories for changes. It’s common to encounter the system limit on the number of files they monitor.

inotify requires a watch handle to be set for each directory in the project. Unfortunately, the default limit of watch handles will not be enough for sized projects, and reaching the limit will force the jetbrains platform to fall back to recursive scans of directory trees.

Create a file (as root) called /etc/sysctl.d/idea.conf and add the following content to it to increase the number of watchers to 512K

fs.inotify.max_user_watches = 524288

Then call sysctl to reload the settings and apply the new configuration

[george@fedora ~]$ sudo sysctl -p --system;
  •  -p[FILE] or --load[=FILE]: Load in sysctl settings from the file  specified  or /etc/sysctl.conf if none  given.
    Specifying - as filename means reading data from standard input. Using this option will mean arguments to sysctl are files, which are read in the order they are specified.
    The file argument may be specified as regular expression.
  •  --system: Load settings from all system configuration files. 
     /run/sysctl.d/*.conf
 /etc/sysctl.d/*.conf
 /usr/local/lib/sysctl.d/*.conf
 /usr/lib/sysctl.d/*.conf
 /lib/sysctl.d/*.conf
 /etc/sysctl.conf

Fedora 25: install / start / enable ssh server

 in GNU/Linux  tagged fedora / openssh-server / server / ssh by

Install

To install the openssh-server, you need to install the openssh-server package:

sudo dnf install -y openssh-server;

Start

To start the sshd daemon (openssh-server) in the current session:

sudo systemctl start sshd.service;

Stop

To stop the active (if any) sshd daemon in the current session:

sudo systemctl stop sshd.service;

Enable

To configure the sshd daemon to start automatically at boot time:

sudo systemctl enable sshd.service;

You will get an output similar to this:

ln -s '/usr/lib/systemd/system/sshd.service' '/etc/systemd/system/multi-user.target.wants/sshd.service'

Disable

To configure the sshd daemon to stop automatic initialization at boot time:

sudo systemctl disable sshd.service;

Fedora 25 with GNOME 3: Making a Wi-Fi hotspot 7

 in GNU/Linux  tagged fedora / gnome / hotspot / network manager / nm-connection-editor / wi-fi by

Recently we tried to create a Wi-Fi hotspot on Fedora 25 running GNOME 3.

When we clicked on the Use as Hotspot... button  on the network manager it did not activate the hotspot.
Actually, nothing changed after we clicked on the button.
We tried this several times, some while being disconnected from all networks, others with having the Wi-Fi device disabled etc. None of the tests payed out.

To mitigate the problem, we used nm-connection-editor to create the hotspot configuration and then activate it from the network manager.

After we starter nm-connection-editor, we pressed the Add button to create a new configuration:

From the prompt, we selected the option Wi-Fi and then clicked on the Create... button.

In the newly appeared window, we filled in

  • the Connection name (which is not used by the system, it is only for us to identify which configuration this is),
  • then the SSID (which is the name of the network you will create and connect to),
  • we set Mode to Hotspot

Then we switched to the Wi-Fi Security tab where we filled in the type of protection we want the hotspot to have and the password for it.

We clicked Save and then we closed the Network Connections window as well.

From the network manager, we clicked on Use as Hotspot... button and then the Turn On button on the confirmation popup to finish the activation.

After this, the network manager changed its screen and showed a page which had all the necessary information that are needed to connect to our newly created hotspot.

Note:

In case you cannot connect because the password verification fails even though you are providing the correct password, you can always do the ugly hack of setting up a hotspot with no security to get your job done…

g++ not found on Fedora 25

 in GNU/Linux  tagged dnf / fedora / g++ / group / install by

On a Fedora 25 (64bit) we got the error g++ not found.

We could have installed g++ using:


sudo dnf install gcc-c++ -y;

But we wanted to install all common additional development tools that we might need for C/C++ development in the future without going over the list of available packages to find which ones.
To do so, we installed all the packages of the group that is marked to be used for C development using dnf as follows:


sudo dnf group install "C Development Tools and Libraries" -y;