Fedora on the bin

Fedora 20: Use PPTP VPN

Tue, 15 Sep 2015 00:00:00 +0000

I have had this one in the queue for a while (I don’t even run of Fedora 20 anymore). This one will be short and sweet, because there really isn’t a bunch of discussion that needs to go into it.

By default Fedora 20 will block outbound PPTP VPN connections.

 bash
 
 
firewall-cmd --direct --add-rule ipv4 filter INPUT 0 -p gre -j ACCEPT
firewall-cmd --direct --add-rule ipv6 filter INPUT 0 -p gre -j ACCEPT

Reload the rules.

Fedora 20: Firefox Reports Flash as Vulnerable

Wed, 04 Mar 2015 00:00:00 +0000

This problem starts with Firefox reporting that your flash-plugin is out of date. This report looks like this and disables all flash.

After this we will take a look Mozilla’s Plugin Check to see what it thinks is going on.

Now here we can see that version 11.2.202.440 is vulnerable. We will then check about:plugins to see if it agrees.

Again this is also reporting 11.2.202.440, so there must be a problem, but it also tells us that there is an update available. Now I run regular yum updates on this machine, and I actually noticed flash-plugin was updated just a few hours prior to seeing this alert. So lets check the installed version.

SQL Developer Crash on Fedora 20

Tue, 01 Jul 2014 00:00:00 +0000

I ran into a painful issue on Fedora 20 with SQL Developer. Basically every time it was launched via the shortcut it would go through loading, and then disappear.

Manual Invocation of SQL Developer

When launching it via the script itself it gives us a little more information.

 bash
 
 
/opt/sqldeveloper/sqldeveloper.sh

Oracle SQL Developer
Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.

 

LOAD TIME : 279#
A fatal error has been detected by the Java Runtime Environment:
#
SIGSEGV (0xb) at pc=0x00000038a1e64910, pid=12726, tid=140449865832192
#
JRE version: Java(TM) SE Runtime Environment (7.0_40-b43) (build 1.7.0_40-b43)
Java VM: Java HotSpot(TM) 64-Bit Server VM (24.0-b56 mixed mode linux-amd64 compressed oops)
Problematic frame:
C 0x00000038a1e64910
#
Failed to write core dump. Core dumps have been disabled. To enable core dumping, try "ulimit -c unlimited" before starting Java again
#
An error report file with more information is saved as:
/opt/sqldeveloper/sqldeveloper/bin/hs_err_pid12726.log
[thread 140449881597696 also had an error]
#
If you would like to submit a bug report, please visit:
http://bugreport.sun.com/bugreport/crash.jsp
#
/opt/sqldeveloper/sqldeveloper/bin/../../ide/bin/launcher.sh: line 611: 12726 Aborted (core dumped) ${JAVA} "${APP_VM_OPTS[@]}" ${APP_ENV_VARS} -classpath ${APP_CLASSPATH} ${APP_MAIN_CLASS} "${APP_APP_OPTS[@]}"

I also noticed, that while executing as root it worked. However that clearly isn’t the “solution”

Bash: Automatically Mount File Systems on Volume Group if Present

Thu, 02 Aug 2012 00:00:00 +0000

Update 09/16/2015 – I have published an updated article for this here: http://blog.allanglesit.com/2012/08/bash-automatically-mount-file-systems-on-volume-group-if-present/

In my laptop I have a solid state disk, and frankly I am way past addicted to solid state disks, but what you get in performance you lose in capacity. As such I have had to be creative with how I can have the capacity and the performance that I need. Lately the solution has been to have a spinning disk in the slot that would normally be occupied by my CD/DVD drive. However the problem with this, revealed itself to be that my Fedora install would actually fail to boot when it tried and failed to mount the file systems if this device was not present. So my first “solution” was to set noauto in the /etc/fstab for these secondary file systems. Which presented a new problem… I would forget to manually mount these devices before launching Virtualbox to start my VMs. So I decided that I would need to have an auto-mount script which would check for the volume group to be present and then if it was mount the file systems contained within the /etc/fstab which live on the volume group.