A Technical I.T./DevOps Blog
Problem scenario
You try to compile a program with “gcc nameofprog.cc”. You get this output:
“warning: deprecated conversion from string constant to ‘char*’ [-Wwrite-strings]”
What do you do to compile your program?
Solution
The program may still compile and run. Look for the a.out file to be created. It may be a working C program. Just run it like this: ./a.out
To get rid of the error,
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Problem scenario
You ran this command: sudo repoquery openssl* –qf “%{name} %{size:m}”
You saw the following:
openssl 492 M
openssl-devel 1542 M
openssl-devel 1542 M
openssl-libs 991 M
openssl-libs 1221 M
openssl-perl 70.3 M
openssl-pkcs11 54.3 M
openssl-static 1068 M
openssl-static 1268 M
openssl098e 803 M
openssl098e 793 M
You know that the openssl packages are
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Problem scenario
You like the backup feature of a code versioning tool for potentially restoring files in a disaster recovery situation. You want to store complete code bases including necessary configuration files in such a repository.
This reputable link (https://www.cyberciti.biz/tips/my-10-unix-command-line-mistakes.html) says to use code versioning tools to store configuration files. However this different reputable link says to not use code versioning tools to store configuration files. Can you store .ini and other configuration files in a version control system?
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Problem scenario
You run “docker ps -a” and see values in the PORTS column. You see values such as these for two separate containers:
Container 1 has this: 0.0.0.0:32775->5000/tcp
Container 2 has this: 5731/tcp
You cannot reach the containers that have no “->” symbol in them via web browsers or other network connectivity tools. You can reach those containers with the “->” symbol in the PORTS value.
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Problem scenario
You want to use Terraform to deploy EC-2 instances (VMs in AWS). How do you do this?
Solution
These directions can work on a Linux server in your enterprise, a Linux server in Azure or a Linux server in AWS.
1. Install Terraform. See this link if you do not know how.
2. Create a file like this called contint.tf with this as the content:
provider “aws” {
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Continue reading “How Do You Use Terraform to Create AWS Servers?”
Problem scenario
You want to install and configure Artifactory in a Docker container on Linux. How do you do this?
Solution
Prerequisites
i. You must have Docker installed. If you need assistance, click on the link for your distribution of Linux:
ii.
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Continue reading “How Do You Deploy Artifactory in a Docker Container?”
Problem scenario
You are running Debian 9 in GCP. You want to install Docker on this server. What should you do?
Solution
1. Create a script in /tmp/ call installer.sh with the following lines of content:
#!/bin/bash
apt-get -y update
apt-get install -y apt-transport-https ca-certificates wget software-properties-common
wget https://download.docker.com/linux/debian/gpg
apt-key add gpg
echo “deb [arch=amd64] https://download.docker.com/linux/debian $(lsb_release -cs) stable” | sudo tee -a /etc/apt/sources.list.d/docker.list
apt-get -y update
apt-cache policy docker-ce
apt-get -y install docker-ce
2.
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Continue reading “How Do You Install Docker on Debian 9 in GCP?”
Updated 12/26/18
Problem scenario
You want to deploy (install and configured) Redis (an in-memory data store) to an Ubuntu 16.x or an 18.x server. What do you do?
Solution
These directions were based on this external posting as they appeared on 3/25/18.
1. Install some dependencies with these two commands:
[Sassy_Social_Share]Problem scenario
You want to install Docker. You want directions for installing it with and without making changes to how packages are installed on the Linux server. You want directions that apply to Linux servers in AWS, Azure, or GCP. You want directions that can apply to CentOS/RHEL, SUSE, or Ubuntu. What do you do?
Solution
Find the link below that is the most appropriate for your needs.
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Problem Scenario
You have installed Apache Cassandra on Linux. It is deployed as a single node configuration (not a cluster). When you run “cqlsh” you get this error:
“Connection error: (‘Unable to connect to any servers’, {‘127.0.0.1’: error(111, “Tried connecting to [(‘127.0.0.1’, 9042)]. Last error: Connection refused”)})”
How do you troubleshoot cqlsh when you get this message “”Tried connecting to [(‘127.0.0.1’, 9042)]. Last error: Connection refused”)})”?
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Continue reading “How Do You Troubleshoot the Cassandra Problem about “Connection refused”?”