Setup Docker service to use insecure(http) registry instead of https

By default docker use https to connect to docker registry. But there can be use cases to use insecure registry. Here are the steps to use insecure registry.

In ubuntu
edit the file /etc/default/docker and update DOCKER_OPTS e.g

DOCKER_OPTS='--insecure-registry 10.84.34.155:5000'

where 10.84.34.155 is ipaddress of registry and 5000 is your port on which registry is configured.

In Centos
Edit the file /etc/docker/daemon.json e.g.

{
"insecure-registries" : ["10.84.34.155:5000"]
}

where 10.84.34.155 is ipaddress of registry and 5000 is your port on which registry is configured.

Restart docker
$ service docker restart

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What is HTTP (HyperText Transfer Protocol)

Short for HyperText Transfer Protocol, the underlying protocol  used by the World Wide Web. HTTP defines how messages are formatted and transmitted, and what actions Web servers and browsers  should take in response to various commands. For example, when you enter a URL in your browser, this actually sends an HTTP command to the Web server directing it to fetch and transmit the requested Web page.

The other main standard that controls how the World Wide Web works is HTML, which covers how Web pages are formatted and displayed.

HTTP is called a stateless protocol because each command is executed independently, without any knowledge of the commands that came before it.

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Apache and HTTP Interview Questions and Answers – Interview Guide

apache-and-http-interview-question-answers

Apache and HTTP Interview Questions and Answers – Interview Guide

List of Apache and HTTP Interview Questions: –

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  1. On a fresh install, why does Apache have three config files – srm.conf, access.conf and httpd.conf? – The first two are remnants from the NCSA times, and generally you should be ok if you delete the first two, and stick with httpd.conf.
  2. What’s the command to stop Apache? – kill the specific process that httpd is running under, or killall httpd. If you have apachectl installed, use apachectl stop.
  3. What does apachectl graceful do? – It sends a SIGUSR1 for a restart, and starts the apache server if it’s not running.
  4. How do you check for the httpd.conf consistency and any errors in it? – apachectl configtest
  5. When I do ps -aux, why do I have one copy of httpd running as root and the rest as nouser? – You need to be a root to attach yourself to any Unix port below 1024, and we need 80.
  6. But I thought that running apache as a root is a security risk? – That one root process opens port 80, but never listens to it, so no user will actually enter the site with root rights. If you kill the root process, you will see the other kids disappear as well.
  7. Why do I get the message “… no listening sockets available, shutting down”? – In Apache 2 you need to have a listen directive. Just put Listen 80 in httpd.conf.
  8. How do you set up a virtual host in Apache?
    <VirtualHost www.techinterviews.com>
    ServerAdmin admin@techinterviews.com
    DocumentRoot /home/apache/share/htdocs/hostedsites
    ServerName www.techinterviews.com
    ErrorLog /home/apache/logs/error/hostedsites/error_log
    TransferLog /home/apache/logs/access/hostedsites/access_log
    </VirtualHost>
  9. What is ServerType directive? – It defines whether Apache should spawn itself as a child process (standalone) or keep everything in a single process (inetd). Keeping it inetd conserves resources. This is deprecated, however.
  10. What is mod_vhost_alias? – It allows hosting multiple sites on the same server via simpler configurations.
  11. What does htpasswd do? – It creates a new user in a specified group, and asks to specify a password for that user.
  12. If you specify both deny from all and allow from all, what will be the default action of Apache? – In case of ambiguity deny always takes precedence over allow.
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