Endian DHCP stopped and failing to start on 3.0.5beta1

TL:DR Updated Endian this morning, and the DHCP service failed to start. Turns out having a 2nd DNS server set in the Web GUI doesn’t correctly write to the dhcp.conf file. Solution. Remove 2nd DNS server or manually add a comma (,) into the config file using nano.

In the Web GUI under “Status -> System Status”

The DHCP server was shown as “Stopped”.

Manually starting from the shell also failed.

‘service dhcpd start’

A quick look in the logs:

‘cat /var/log/messages’

Feb 25 10:22:51 endian dhcpd: Internet Systems Consortium DHCP Server V3.0.5-RedHat
Feb 25 10:22:51 endian dhcpd: Copyright 2004-2006 Internet Systems Consortium.
Feb 25 10:22:51 endian dhcpd: All rights reserved.
Feb 25 10:22:51 endian dhcpd: For info, please visit http://www.isc.org/sw/dhcp/
Feb 25 10:22:51 endian dhcpd: /etc/dhcpd.conf line 21: semicolon expected.
Feb 25 10:22:51 endian dhcpd:         option domain-name-servers 192.168.0.3 192.
Feb 25 10:22:51 endian dhcpd:                                                ^
Feb 25 10:22:51 endian dhcpd: Configuration file errors encountered -- exiting
Feb 25 10:22:51 endian dhcpd:
Feb 25 10:22:51 endian dhcpd: If you did not get this software from ftp.isc.org, please
Feb 25 10:22:51 endian dhcpd: get the latest from ftp.isc.org and install that before
Feb 25 10:22:51 endian dhcpd: requesting help.
Feb 25 10:22:51 endian dhcpd:
Feb 25 10:22:51 endian dhcpd: If you did get this software from ftp.isc.org and have not
Feb 25 10:22:51 endian dhcpd: yet read the README, please read it before requesting help.
Feb 25 10:22:51 endian dhcpd: If you intend to request help from the dhcp-server@isc.org
Feb 25 10:22:51 endian dhcpd: mailing list, please read the section on the README about
Feb 25 10:22:51 endian dhcpd: submitting bug reports and requests for help.
Feb 25 10:22:51 endian dhcpd:
Feb 25 10:22:51 endian dhcpd: Please do not under any circumstances send requests for
Feb 25 10:22:51 endian dhcpd: help directly to the authors of this software - please
Feb 25 10:22:51 endian dhcpd: send them to the appropriate mailing list as described in
Feb 25 10:22:51 endian dhcpd: the README file.
Feb 25 10:22:51 endian dhcpd:
Feb 25 10:22:51 endian dhcpd: exiting.

 

Luckily the log points us in the right direction.

/etc/dhcpd.conf line 21: semicolon expected.
Feb 25 10:22:51 endian dhcpd:         option domain-name-servers 192.168.0.3 192.

In the Web GUI if I remove the 2nd Name server, all is well, the service starts up and the log shows requests being received.
When I add it back in, it fails to start again.

When I add the comma in using nano, I’m able to manually start the service.
Although I’m sure it will break if any changes are made to the web gui.

Update: It appears that this bug has been around for a few days, and is reported: https://jira.endian.com/browse/UTM-1388

Bridged ADSL modem over VLAN Router on a Stick

TL;DR: Bridged ASDL modem over VLAN – yes it can work!

The problem:
x86 Router (Endian) has run out of physical network cards, but more WAN ports are required, can we do something with a ‘Router on a stick’ and use a VLAN aware Switch?

We can do this in a ‘double NAT’ style configuration, but can we do it in a bridged mode configuration. It seems that we can in fact. However I’m using a L3 switch (Dell 6248) I have tired in the past to use a HP PS1810-8G Switch (J9833A) without successful (granted I didn’t spend too much time on it).

Xero API pyXero and Anaconda Python

Personal TL;DR notes on getting this to work, not a tutorial.

Download Install Anaconda
– At the time of writing it didn’t create Windows Shortcuts, fix this with openning cmd as admin

‘c:\Anaconda2\scripts\conda.exe install menuinst’

Agree to Updates

‘c:\Anaconda2\scripts\conda.exe install -f console_shortcut ipython ipython-notebook ipython-qtconsole launcher spyder’

Agree to updates.

Now there should be shortcuts in:

C:\ProgramData\Microsoft\Windows\Start Menu\Programs\Anaconda2 (64-bit)

Now onto Xero

  • git clone https://github.com/freakboy3742/pyxero.git
  • Open up Anaconda Prompt (Anaconda2x64)
  • cd into folder with git of pyxero
  • use command: python setup.py install
  • pip uninstall oauthlib
  • pip install oauthlib==0.7.2

The last two commands fix the error: ImportError: No module named jwt.algorithms

Again these are personal notes, not a full blown tutorial.

 

Dell Powerconnect 5424 SNMP web management issue

Just ran into a strange issue when configuring a SNMP community on the web interface. Alas it was broken.

2016-01-19 10_36_26-ATKOSD22016-01-19 10_36_26-ATKOSD2

And clicking on “add’ results in an error

‘Access Error: Request Entity Too Large’2016-01-19 10_36_47-ATKOSD2
An easy fix is to stop being lazy and CLI into the switch and fix it.

The command:

snmp-server community public su 192.168.0.5

2016-01-19 10_39_23-Greenshot image editor

And look, it works for us. Now you can webconfig until your heart is content.

2016-01-19 10_38_07-ATKOSD2

Don’t forget to write your switch config changes.

Reference: Dell 5424 CLI Manual, Page 328 ‘snmp-server community’

Issue with WordPress Autoptimize Cache filling up cPanel Server Space.

Issue with Autoptimize Cache filling up cPanel Server Space.
As a temporary fix, just run a cron to delete all the cache files once an hour.
– I have only seen this issue with a Multisite install, but I haven’t had a problem on single site installs.

Log into cPanel go to CRONs

Under ‘Add a New Cron Job’ use the following settings:

Minute: 7
Hour: *
Day: *
Month: *
Weekday: *

Under the command section you need to first work out where your WordPress site is installed,
usually under cPanel it is under /home/[your_cpanel_username]/public_html/

Then you need to add the folder of the Autoptimize Cache folder, so the entire thing looks something like this:

/home/[your_cpanel_username]/public_html/wp-content/wp-content/cache/autoptimize/

Add the command rm -r at the start, put it all together and you have the right command:
!IMPORTANT! – The command rm -r will delete everything in the folder, if you get the path to the folder wrong, you could delete your entire website. You have been warned!

rm -r /home/[your_cpanel_username]/public_html/wp-content/wp-content/cache/autoptimize/

 

2016-01-14 10_20_04-cPanelX-CronJobs

So what we are doing is just at 7 minutes past the hour, of all hours, of all days, of all months, each weekday (that’s how you read the * in the cron) we delete all the files in the folder that we told it too.

check_mk_agent over SSH Host key verification failed

Service discovery failed for this host: Agent exited with code 255: Pseudo-terminal will not be allocated because stdin is not a terminal. Host key verification failed.

Current Setup: Ubuntu 14.04 running OMD

Solution: Running the ssh command from the OMD user appears to fix the problem by allowing them into the known hosts list.

Here’s how:

linuxuser@ubuntu_vm:~$ sudo su
[sudo] password for linuxuser:
root@ubuntu_vm:/home/scadmin# su [omd-site-name]
ubuntu_vm[[omd-site-name]]:~$

then run your remote command eg:

ubuntu_vm[[omd-site-name]]:~$ ssh -l root -i /etc/check_mk/check_mk.key [ip]

It will ask to save the host to the known hosts, type yes and enter. It should then output the status from the check_mk agent.

Apple TV vs Chromecast for Netflix / YouTube access on your TV

The great debate in the wonderful land of mobile devices, Apple vs Google. But what happens when you start to mix ecosystems between the two.

I’m an iPhone 4s (stop laughing, I realise it’s 2025) and iPad mini 2 guy, but when it comes to putting content on my TV, I’ve tested both the Apple TV & the humble Chromecast & funnily I prefer the…..Chromecast.

The Apple TV allows sharing of your screen (which is nice to have), along with the ability to stream apps & games, but the downside, no multitasking. Say you flick a Netflix movie up from your iPad to your Apple TV, then head over safari which then sends you to YouTube, bam! Netflix stops showing your movie. However with the Chromecast you can multitask, you can watch your Netflix Movie on your TV & your YouTube clip on your iPad. 

The way Netflix & the YouTube apps hand off to the Chromecast allow you to continue using the app & search for more content to watch, the YouTube app even allows for “queuing” up content.

Unfortunately the Chromecast doesn’t support mirroring from the iPad. But you can mirror from the Google Chrome web browser with the aid of an extension which I haven’t used an awful lot, but it is handy.

So if you want a cheap way to show Netflix or YouTube from your iPad to your TV, the humble $50 Chromecast is a winner.