A Technical I.T./DevOps Blog
Problem scenario
You try to compile a program with “gcc nameofprog.cc”. You get this output: “foobar.cc.:55:error: expected ‘;’ before string constant”
What do you do to compile your program?
Solution
Go to line 55 of foobar.cc. If there is a printf command, be sure that the thing to be printed is surrounded by parentheses. Here is an example of a line that will cause the problem:
printf “This is a test”;
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Problem scenario
You try connect via your wireless router to a WiFi network (e.g., at a restaurant, hotel, or public library). You open a web browser because you were told you would be prompted with a splash screen. On this page you would agree to the terms of service and/or enter a password. You are not seeing this web page. You try different URLs (e.g., www.yahoo.com, www.google.com). You are never prompted for a username or password.
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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.
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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:
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