A Technical I.T./DevOps Blog
Problem scenario
You are trying to log into a Docker registry but you get this message:
“Got permission denied while trying to connect to the Docker daemon socket at unix:///var/run/docker.sock: Post http://%2Fvar%2Frun%2Fdocker.sock/v1.29/auth: dial unix /var/run/docker.sock: connect: permission denied”
You know the credentials are correct. What is wrong?
Root cause
It could be that your user account is not a member of the “docker” group on the Linux system.
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Problem scenario
You install the Lua Just-In-Time package named luajit (e.g., with sudo apt-get -y install luajit). You are trying to install Snort. When you run the ./configure script, you get this error:
“
— Checking for module ‘luajit’
— No package ‘luajit’ found
CMake Error at /usr/share/cmake-3.5/Modules/FindPackageHandleStandardArgs.cmake:148 (message):
/usr/bin/luajit-2.0.4
/usr/share/luajit-2.0.4/jit
“
You tried this:
./configure_cmake.sh –with-luajit-libraries=/usr/share/luajit-2.0.4/jit/ –with-luajit-includes=/usr/bin
But that command failed too.
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Problem scenario
You installed Puppet Master on an AWS instance of RedHat Enterprise Linux. (See this link if you want to install Puppet Master.) You now want another AWS instance of RHEL 7.x to be configured as a Puppet Agent node. You want to run a manifest to make sure that this new Puppet Agent node (i.e., server) is working with your Puppet Master server. What do you do to install Puppet Agent 5.x on a RedHat Linux server and configure it to work with Puppet Master?
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Continue reading “How Do You Deploy Puppet Agent to a RedHat Linux Instance in AWS?”
Problem scenario
You are using a Debian distribution of Linux. You want to upload and download files to S3 without using the GUI. You want to be able to automate processes with scripts that interact with S3 from your Ubuntu Linux server. How do you do this?
Solution
The procedures have two parts after you have the prerequisites met.
Prerequisites
i.
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Question
In DevOps engineering you hear the term “build”, what is it?
Answer
A build is usually a binary file which is an executable application. In DevOps engineering a build is usually compiled from a specific version of source code. In the context of Jenkins it is the “[r]esult of a single execution” of a Jenkins project (previously known as a Jenkins job).
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As of 12/1/17 the module to install Docker via Puppet on forge.puppet.com is not working for AWS instances. This known bug is blocking it from working.
[Sassy_Social_Share]Question
What is Apache Parquet?
Answer
Apache Parquet is columnar data representation/manipulation tool for a Hadoop ecosystem. Data in a given column is largely uniform (e.g., a long string of characters, a single character, or an integer) in that it repeats a specific type and format of data as opposed to two cells in the same row (which may be very dissimilar types of data).
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Problem scenario
You want to install Apache Parquet on the Hadoop namenode. What do you do?
Solution
Prerequisite
This assumes that you have installed Hadoop. For directions, see this posting.
Procedure
Run these commands:
sudo su –
apt-get -y install pip
pip install thriftpy
pip install snappy
exit
sudo apt-get -y install libsnappy-dev thrift-compiler
curl https://pypi.python.org/packages/74/b5/bc459aab0566fc3cf3397467922c37411ab6e3361bab9e0ca165e1089ce8/parquet-1.2.tar.gz#md5=05aacec0620ac63ecd7dd77bf7fb9fee >
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Problem scenario
You want to install Snort on a Red Hat Enterprise Linux server. How do you do this?
Solution
1. Log into the server.
2. Create a file /tmp/snortinstaller.sh with the following content:
yum -y install libdnet
yum -y install https://www.snort.org/downloads/snort/daq-2.0.6-1.f21.x86_64.rpm
curl https://rpmfind.net/linux/fedora/linux/development/rawhide/Everything/x86_64/os/Packages/l/libnghttp2-1.28.0-1.fc28.x86_64.rpm libnghttp2-1.28.0-1.fc28.x86_64.rpm
rpm -ivh libnghttp2-1.28.0-1.fc28.x86_64.rpm
yum -y install https://www.snort.org/downloads/snort/snort-2.9.11-1.f25.x86_64.rpm
ln -s /usr/lib64/libdnet.so.1.0.1 /usr/lib64/libdnet.1
3.
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Problem scenario
You want to test out UiPath’s abilities to see how RPA works. You want UiPath to automatically log into a website that challenges the human for a username and password.
Solution
Prerequisite #1
This assumes that UiPath Studio has been installed. If you do not know how, see this posting.
Prerequisite #2 (specific to this example only)
For this example we will set up an automation to open a web browser,
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Continue reading “How Do You Use UiPath Studio CE to Log into a Website?”