Ubuntu 15.04 (Vivid Vervet) has switched the init manager from Upstart to systemd. Will the Docker installation change? Let’s give a try and install it on a Google Compute Engine instance.

Install Docker:

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$ curl -sSL https://get.docker.com/ | sh

Add user to Docker group for running commands without sudo:

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$ sudo usermod -aG docker ${USER}

Log out, then log back in.

Verify the installation:

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$ docker run hello-world
Hello from Docker.
This message shows that your installation appears to be working correctly.
To generate this message, Docker took the following steps:
1. The Docker client contacted the Docker daemon.
2. The Docker daemon pulled the "hello-world" image from the Docker Hub.
3. The Docker daemon created a new container from that image which runs the
    executable that produces the output you are currently reading.
4. The Docker daemon streamed that output to the Docker client, which sent it
    to your terminal.
To try something more ambitious, you can run an Ubuntu container with:
$ docker run -it ubuntu bash
Share images, automate workflows, and more with a free Docker Hub account:
https://hub.docker.com
For more examples and ideas, visit:
https://docs.docker.com/userguide/

For upgrading, the process is the same as installing:

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$ curl -sSL https://get.docker.com/ | sh

From io.js back to Node.js, time to update my installation guide.

Install via Package Manager

Install in Ubuntu directly via apt:

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$ sudo apt-get install -y nodejs

However, it will not give you the latest version. So, use an alternative method.

For Node.js v0.12:

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$ curl -sL https://deb.nodesource.com/setup_0.12 | sudo bash -
$ sudo apt-get install -y nodejs

For io.js v3.x:

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$ curl -sL https://deb.nodesource.com/setup_iojs_3.x | sudo bash -
$ sudo apt-get install -y iojs

Install from the Source

Install build tools:

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$ sudo apt-get install -y build-essential

Clone the Node.js repository from GitHub:

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$ git clone https://github.com/nodejs/node.git

Future Node.js releases will be from this repo: https://github.com/nodejs/node.

Check out a specific version:

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$ cd node && git checkout v3.2.0

Install globally:

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$ ./configure && make && sudo make install

Commands:

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$ curl -sSL https://get.docker.io/ubuntu/ | sudo sh
$ sudo usermod -a -G docker $USER
$ sudo service docker restart
$ logout

Explanation:

1. One line command installation
2. Add the user to the group docker
3. Restart the daemon
4. Make sure to logout and log back in, in order to sudoless Docker taking effect.

To build Redis from source, we first need to install TCL 8.5 or newer, this is needed for make test later:

$ sudo apt-get install -y tcl

Now clone and make:

$ git clone https://github.com/antirez/redis
$ git checkout 2.8.13
$ make
$ make test
$ sudo make install
$ sudo utils/install_server.sh

Binary (redis-cli and redis-server) will be installed into /usr/local/bin.

The last command with utils/install_server.sh is an interactive command. Since the script is a shell script using the read built-in command and -p option for prompt, we can make it non-interactive by redirecting input from echo command:

$ echo -n | sudo utils/install_server.sh

Without pumping any value into the script, the default values are used.

If really want to customize it, we can add our own values:

$ echo -e \
  "${PORT}\n${CONFIG_FILE}\n${LOG_FILE}\n${DATA_DIR}\n${EXECUTABLE}\n" | \
  sudo utils/install_server.sh

There are 6 read statements, hence n - 1 newline characters. Without using -n, the last newline character is supplied by echo.

Here are the default values:

PORT=6379
CONFIG_FILE=/etc/redis/6379.conf
LOG_FILE=/var/log/redis_6379.log
DATA_DIR=/var/lib/redis/6379
EXECUTABLE=/usr/local/bin/redis-server

The utils/install_server.sh script should return something like this:

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Welcome to the redis service installer
This script will help you easily set up a running redis server
Selecting default: 6379
Selected default - /etc/redis/6379.conf
Selected default - /var/log/redis_6379.log
Selected default - /var/lib/redis/6379
Selected config:
Port           : 6379
Config file    : /etc/redis/6379.conf
Log file       : /var/log/redis_6379.log
Data dir       : /var/lib/redis/6379
Executable     : /usr/local/bin/redis-server
Cli Executable : /usr/local/bin/redis-cli
Copied /tmp/6379.conf => /etc/init.d/redis_6379
Installing service...
 System start/stop links for /etc/init.d/redis_6379 already exist.
Success!
/var/run/redis_6379.pid exists, process is already running or crashed
Installation successful!

Set an alias for Redis client:

$ cd /usr/local/bin && sudo ln -s redis-cli redis

For more advanced install, see the README file.