A Technical I.T./DevOps Blog
Problem scenario
You installed Jira 7.x on RHEL 7.x in AWS. You try to go to the URL to finish installing and configuring it, but the web UI does not load. On the back-end you see that there is a service listening on port 8080 (with a sudo netstat -anlp | grep 8080 command). You know that now AWS Security Group is blocking port 8080 from the external IP address of the server.
…
Continue reading “After Installing Jira on a RHEL Server, How Do You Access the Web UI for Jira?”
Problem scenario
How do you install Jira on any distribution of Linux (e.g., CentOS/RHEL/Fedora, Debian/Ubuntu, or SUSE)?
Prerequisite
Do you have 3 GB of RAM? 1 GB of RAM will work, but you only if you have 2 GB of virtual memory. (With 1 GB of RAM or less and no virtual memory on the server, the installation will fail. The catalina.out log will report an error about insufficient memory.)
…
Continue reading “How Do You Install Jira on a Linux Server?”
Problem scenario
You are trying to install Jira on Linux. You log into the web UI to finish configuration. The process stalls at this stage:
” Finishing your setup
Now sit back while we set up your JIRA instance. It will take a minute or two to complete.
Configuring your database
Initializing the plugin system – Don’t worry, I’m still working…”
On the back-end you may notice the server’s load average gets above 5.
…
Problem scenario
You have a Linux server (a Debian/Ubuntu, CentOS/RedHat/Fedora or SUSE distribution). You want to install Apache Avro. What do you do?
Solution
These directions work for any type of Linux.
#1 Do one of the following (either option A or option B).
Option A
Find the latest download from here and download it.
Option B
cd /tmp
curl http://mirror.metrocast.net/apache/avro/avro-1.8.2/avro-src-1.8.2.tar.gz >
…
Problem scenario
You find that your Jira is very slow and sometimes stalls or hangs when it is being used. The Linux back-end of the Jira server shows considerable CPU and memory constraints. When Jira is up on the back end you use the Linux “top” command, you find that the CPU and RAM are being heavily utilized. You want to optimize the system for improved performance.
…
Continue reading “What Can Be Done to Enhance the Reliability and Performance of a Jira Server?”
Problem scenario
You created a DB instance in RDS. You cannot connect to it. What should you do?
Solution
1. Make sure that it is “Available.” It could have been turned off.
2. Click on the Instance and confirm the relevant Security Group allows you to connect to it.
3. Click on the Instance and search for “Publicly accessible”. Make sure this is set to “Yes.” If it is set to “No” you may have to take a snapshot of the instance and launch that snapshot with the “Publicly accessible” option.
…
Continue reading “How Do You Troubleshoot Connecting to an RDS Instance?”
Problem scenario
You see this line of Python code: for x in range ( len(coolList), 0, -1 ): print x
You are curious how that works and what that syntax means.
Answer
The first of the three parameters is the integer that corresponds to the starting number of the iteration. The second variable is the range position that will terminate the iteration of the range function.
…
Continue reading “How Does Python’s Range Function Work When Three Parameters Are Passed?”
Problem scenario
On your Linux CentOS 6.x server you run “python –version” and find that Python 2.6 is installed. You want Python 2.7 to be installed instead. You do not want to use binaries (e.g., .rpm packages) or yum repositories. What do you do?
Solution
Run these commands:
curl -k https://www.python.org/ftp/python/2.7.14/Python-2.7.14.tar.xz > Python-2.7.14.tar.xz
sudo mv Python-2.7.14.tar.xz /usr/bin/
cd /usr/bin/
sudo tar xf Python-2.7.14.tar.xz
cd Python-2.7.14
sudo ./configure –prefix=/usr/local
sudo make &&
…
Continue reading “How Do You Upgrade Python 2.6 to Python 2.7 on CentOS 6?”
Problem scenario
You want to build your own Python module. You want this module to be able to be imported on your Linux server with Python (e.g., with “import contint”). How do you write such a module?
Possible Solution #1
Write a .py file for the module, and place it where Python will look. To find the location run these three commands:
python
import sys
print(sys.path)
# This command above will display directory paths for your .py file (the module that will be able to be imported).
…
Continue reading “How Do You Write Your Own Custom, Importable Module in Python?”
Problem scenario
You want to install Jenkins on a RedHat derivative Linux server (e.g., CentOS, RHEL, or Fedora). What do you do?
Solution
1. Run these commands:
curl https://pkg.jenkins.io/redhat-stable/jenkins.repo > /tmp/jenkins.repo
sudo mv -i /tmp/jenkins.repo /etc/yum.repos.d/jenkins.repo
sudo rpm –import https://pkg.jenkins.io/redhat-stable/jenkins.io.key
2. Run this command:
sudo yum -y install java jenkins
# When you see the “Package configuration” menu that says “Configuring grub-pc” press the tab key (to get to the “Ok” option for “keep the local version currently installed”).
…
Continue reading “How Do You Install Jenkins on a CentOS/RedHat/Fedora server?”