Red Branch | For Future Reference …
Download the latest version of the Arduino IDE as the version in the Ubuntu/Mint/Debian repositories is a little old: https://www.arduino.cc/en/Main/Software At the time of writing I am using version 1.8.5 Configure Arduino IDE First we need to import everything we need to operate the MKR Fox 1200 so first visit Tools > Board > Board… Read more »
Good concise article here on devopscube for installing zookeeper cluster. I’ve added some of my own bits: Firewall Disable firewalld or allow ports 2181 3888 2888 Install Java
|
1 |
yum install java-1.8.0-openjdk |
User Create a zookeeper user
|
1 2 |
groupadd zookeeper useradd -g zookeeper -d /opt/zookeeper -s /sbin/nologin zookeeper |
Install Zookeeper Download ZooKeeper from the Apache:
|
1 2 3 4 5 6 7 8 9 |
wget http://mirrors.ukfast.co.uk/sites/ftp.apache.org/zookeeper/zookeeper-3.4.10/zookeeper-3.4.10.tar.gz mv zookeeper-3.4.10.tar.gz /opt cd /opt tar xzf zookeeper-3.4.10.tar.gz ln -s zookeeper-3.4.10 ./zookeeper cd zookeeper mkdir data |
Set the permissions:
|
1 |
chown -R zookeeper:zookeeper /opt/zookeeper/* |
|
1 |
vi /opt/zookeeper/conf/zoo.cfg |
Add the following:
|
1 2 3 4 5 6 7 8 |
tickTime=2000 initLimit=10 syncLimit=5 dataDir=/opt/zookeeper/data clientPort=2181 server.1=192.168.187.75:2888:3888 server.2=192.168.187.77:2888:3888 server.3=192.168.187.78:2888:3888 |
Test the service:… Read more »
I found that Yakuake was re-opening with an 80% width and about 30% height but I prefer 100% wide and 80% high. So it looks like my settings were saving into the file:
|
1 |
~/.config/yakuakerc |
But this was possibly not the file that was being read when Yakuake started. I added the
|
1 2 3 |
[Window] Height=80 Width=100 |
entries to the… Read more »
So we had a CSV/TSV file with tabs separating each field but one of the fields was a description field that contained spaces. When parsing this TSV file some programs interpreted the spaces as field delimiters (TSV might be a bad idea!). Input file similar to:
|
1 |
NULL NULL 7.0 Huayang Time Warner Cable 4430 |
The ‘Time Warner Cable’ field is all one… Read more »
I installed the relevant Python packages first e.g.
|
1 |
sudo apt-get install flake8 python3-flake8 python3-pep8 python-pep8-naming python3-setuptools pylint3 |
Then on the Atom menu use: Edit > Preferences then search for atom packages such as flake8, pep8, pep257 and pylint: Then click the install button. After restarting style advice is shown in the editor:
I was reminded about how much time I had spent as a kid playing Manic Miner on an Amstrad 464 and decided to give it a try on my current desktop (Linux Mint) so for future reference… I grabbed the code created by here:
|
1 |
git clone https://github.com/lkundrak/manicminer.git |
Installed a few dependencies:
|
1 |
apt-get install libx11-dev libxext-dev |
Run the make file:
|
1 |
make |
I had inadvertently set up slave replication using the wrong channel name – which is a minor issue except that it caused some issues with an already configured Nagios check. To ‘change’ the channel name I stopped the slave process, removed all the slave definitions and used ‘CHANGE MASTER’ to re-create the slave from the… Read more »
Using CentOS 7 this problem arose after a reboot and NFS shares would not mount. Trying to start the rpcbind service:
|
1 |
systemctl start rpcbind |
gave the following error message via jounralctl -xe :
|
1 |
rpcbind.socket failed to listen on sockets: Address family not supported by protocol |
So it looks like
|
1 |
net.ipv6.conf.all.disable_ipv6 = 1 |
was set in /etc/sysctl.conf But this wasn’t yet incorporated into the initramfs. Solution Rebuild the initramfs with:
|
1 |
dracut -v -f |
Use fallocate to create a new 300 MB file :
|
1 |
fallocate -l 300M disk_image.img |
Create an ext4 file system within the image file:
|
1 |
mkfs.ext4 disk_image.img |
Create a mount point:
|
1 |
mkdir /mnt/disk_image |
mount it:
|
1 |
mount -t auto -o loop disk_image.img /mnt/disk_image |
Then on the Dell iDRAC use the ‘Virtual Media’ menu to ‘Map Removable Disk…’ : Then on the host operating system the device can be mounted… Read more »
I was running this docker image proxied via traefik but I was receiving an error message in the Nagios web interface: docker nagios Error: Could not read object configuration data And in the logs from the container:
|
1 2 |
container_name | Warning: File '/opt/nagios/var/perfdata.log' could not be opened - service performance data will not be written to file! container_name | Error: Unable to create temp file '/opt/nagios/var/nagios.tmpAofds4' for writing status data: Permission denied |
To solve the issue I connected to the container:
|
1 |
docker exec -it container_name bash |
And set the nagios user as the… Read more »
