Tag: fedora

DisplayCAL on Fedora 34

DisplayCAL relies on Python2, which is not supported since Fedora 32.

You can download the required packages compiled for Fedora 31, that will work for versions 32/33/34:

  • python2-wxpython
  • puthon2-gobject-base
  • python2-gobject
  • DisplayCAL
wget https://archives.fedoraproject.org/pub/archive/fedora/linux/releases/31/Everything/x86_64/os/Packages/p/python2-wxpython-3.0.2.0-26.fc31.x86_64.rpm https://archives.fedoraproject.org/pub/archive/fedora/linux/releases/31/Everything/x86_64/os/Packages/p/python2-gobject-3.34.0-3.fc31.x86_64.rpm https://archives.fedoraproject.org/pub/archive/fedora/linux/releases/31/Everything/x86_64/os/Packages/p/python2-gobject-base-3.34.0-3.fc31.x86_64.rpm https://rpmfind.net/linux/fedora/linux/releases/31/Everything/x86_64/os/Packages/p/python2-gobject-3.34.0-3.fc31.x86_64.rpm https://displaycal.net/download/Fedora_31/x86_64/DisplayCAL.rpm

CIFS: mount error(112): Host is down

When trying to mount a Windows share using mount, I ran into this problem:

mount -v -t cifs -o username=username,password=password //hostname/sharename /mnt
mount.cifs kernel mount options: ip=XXX.XXX.XXX.XXX,unc=\\hostname\sharename,user=username,prefixpath=sharename,pass=********
mount error(112): Host is down

In my case, the error was due to a protocol mismatch when trying to mount the share: in the latest versions of Windows Server, SMBv1 is disabled.

To reach this conclusion, I ran smbclient in debug mode:

smbclient -L //hostname/sharename -U username -d 3
protocol negotiation failed: NT_STATUS_CONNECTION_RESET

To overcome this issue, I specified the protocol when using mount:

mount -t cifs -o username=username,password=password,vers=3.0 //hostname/sharename /mnt

If you want to use smbclient, add the -m option:

smbclient -L //hostname/sharename -U username -m SMB3

Mounting a Windows share using CIFS

Windows shares can be mounted using cifs option:

mount -t cifs -o username=username,password=password //hostname/sharename /mnt

By default, Windows shares are mounted with 0777 permissions in Linux.

You can change the default permissions using dir_mode and file_mode options in mount:

mount -t cifs -o username=username,password=password,dir_mode=0755,file_mode=0755 //hostname/sharename /mnt

To make the mount persistent, add the entry to /etc/fstab:

//hostname/sharename    /mountpoint   cifs  _netdev,username=username,password=password,dir_mode=0755,file_mode=0755,uid=500,gid=500 0 0

Adding a secondary IP address (CentOS, Fedora, RHEL)

You will not need a secondary NIC but you’ll create virtual adapters as the secondary IP will be routing through the primary.

Network configurations are stored in /etc/sysconfig/network-scripts

network-scripts$ ls -l | grep ifcfg
-rw-r--r--. 1 root root 304 Nov 11 19:04 ifcfg-eth0
-rw-r--r--. 1 root root 254 May 25 2017 ifcfg-lo

You have to name the virtual adapter in a sequential order, e.g., ifcfg-eth0:1, ifcfg-eth0:2 etc.

Copy the physical adapter configuration file:

cp ifcfg-eth0 ifcfg-eth0:1

and configure it to include these parameters:

DEVICE=<device name>
IPADDR=<IP address>
NETMASK=<netmask>

There is no need to configure a MAC address or a default gateway.

To activate the interface you can restart the entire network server (if you can do it) or use:

ifup eth0:1

VMware Remote Console 10.0.1 on Fedora 26

Welcome back to my (almost) daily appointment with “What’s wrong with Fedora today?”.

At work, our servers are VMs on a VMware vSphere; we access them using SSH of course, but sometimes we need to use the remote console from the vSphere Web Client (that is a vmrc link). I upgraded my kernel (and many libraries) last week but since I don’t use vSphere that often, I didn’t noticed anything until a couple of days ago, when a RAM stick failed and our machines crashed, rebooting in emergency mode.

Usually you login, select your VM, click on Launch Remote Console and you’re done. Unfortunately I got this:

reason       appLoader killed by signal 11
cmdline      /usr/lib/vmware/bin/vmrc
executable   /usr/lib/vmware/bin/appLoader
[...]
os_release   Fedora release 26 (Twenty Six)
kernel       4.12.11-300.fc26.x86_64

Continue reading

Fedora 26 and HTML5 video codecs

I upgraded to Fedora 26 weeks ago but I realize only today that I was having issues playing videos in Firefox, while I was trying to attend an online course.

At first I thought it was Flash Player’s fault: I always forget to have it and I always forget to update it. It was indeed out-of-date but the annoying “The media could not be played” error message was still there.

After a quick research and a little help from HTML5test, I noticed that few codecs were missing. I prefer not to install a bunch of codecs that I don’t even know what they’re for; if I am missing something I’m pretty sure it’ll come out! Continue reading

Using fingerprint authentication on Fedora 26

I’ve never ever had any problem using fingerprint authentication on openSUSE 42.1, it worked just out of the box, but when I switched back to Fedora (again), I had some issues configuring it.

On Fedora 26, by default, fingerprint authentication works only for logins but not for sudo. To enable this:

authconfig --enablefingerprint --update

If you’re using an older version of Fedora you can also use:

authconfig-tui

Continue reading

Flushing iptables

You can flush and reset iptables to default running these commands:

iptables -F
iptables -X
iptables -t nat -F
iptables -t nat -X
iptables -t mangle -F
iptables -t mangle -X
iptables -P INPUT ACCEPT
iptables -P FORWARD ACCEPT
iptables -P OUTPUT ACCEPT

The -F command flushes all the chains and -X deletes empty (non-default) chains.
You can also create a script:Continue reading