Installing a Mosquitto broker on Ubuntu Linux_MQTT Essentials：A Lightweight IoT Protocol-QQ阅读男生武侠网

上QQ阅读APP看书，第一时间看更新

Installing a Mosquitto broker on Ubuntu Linux

Now, we will learn the necessary steps to install a Mosquitto broker, also known as Mosquitto MQTT server on the most popular operating systems: Linux, macOS and Windows. First, we will start with Linux; specifically, we will work with Ubuntu Linux. In case you want to work with a different Linux distribution, you can find details about the installation procedure in the Mosquitto downloads section: http://mosquitto.org/download.

Follow these steps to install a Mosquitto broker on Ubuntu Linux. Take into account that you will require root privileges:

Open a Terminal window and run the following command to add the Mosquitto repository:

 sudo apt-add-repository ppa:mosquitto-dev/mosquitto-ppa

After you enter the password, you will see an output similar to the next lines (the temporary file names will be different).

 gpg: keyring `/tmp/tmpj3a50p1p/secring.gpg' created
 gpg: keyring `/tmp/tmpj3a50p1p/pubring.gpg' created
 gpg: requesting key 262C4500 from hkp server keyserver.ubuntu.com
 gpg: /tmp/tmpj3a50p1p/trustdb.gpg: trustdb created
 gpg: key 262C4500: public key "Launchpad mosquitto" imported
 gpg: Total number processed: 1
 gpg: imported: 1 (RSA: 1)
 OK

Run the following command to update the packages with the recently added Mosquitto repository.

 sudo apt-get update

You will see an output similar to the next lines.

 Get:1 http://ppa.launchpad.net/mosquitto-dev/mosquitto-ppa/ ubuntu xenial InRelease [23,8 kB]
 Hit:2 http://security.ubuntu.com/ubuntu xenial-security InRelease
 Hit:3 http://ar.archive.ubuntu.com/ubuntu xenial InRelease
 Hit:4 http://ar.archive.ubuntu.com/ubuntu xenial-updates InRelease
 Get:5 http://ppa.launchpad.net/mosquitto-dev/ mosquitto-ppa/ubuntu xenial/main amd64 Packages [2.048 B]
 Hit:6 http://ar.archive.ubuntu.com/ubuntu xenial-backports InRelease
 Get:7 http://ppa.launchpad.net/mosquitto-dev/ mosquitto-ppa/ubuntu xenial/main i386 Packages [2.048 B]
 Get:8 http://ppa.launchpad.net/mosquitto-dev/mosquitto-ppa/ ubuntu xenial/main Translation-en [1.292 B]
 Fetched 29,2 kB in 1s (21,5 kB/s)
 Reading package lists... Done

Now, run the following command to install the package for the Mosquitto server.

 sudo apt-get install mosquitto

You will see an output similar to the next lines. Enter Y and press Enter to answer the question and complete the installation process.

 Reading package lists... Done
 Building dependency tree
 Reading state information... Done
 The following additional packages will be installed:
 libev4 libuv1 libwebsockets7
 The following NEW packages will be installed:
 libev4 libuv1 libwebsockets7 mosquitto
 0 upgraded, 4 newly installed, 0 to remove and 299 not upgraded.
 8 not fully installed or removed.
 Need to get 274 kB of archives.
 After this operation, 714 kB of additional disk space will be used.
 Do you want to continue? [Y/n]

The last lines should include a line that says Setting up mosquitto, as shown in the following lines:

 Setting up mosquitto (1.4.10-0mosquitto3) ...
 Processing triggers for libc-bin (2.23-0ubuntu3) ...
 Processing triggers for systemd (229-4ubuntu7) ...
 Processing triggers for ureadahead (0.100.0-19) ...

Run the following command to install the Mosquitto client packages that will allow us to run commands to publish messages to topics and subscribe to topic filters.

 sudo apt-get install mosquitto-clients

You will see an output similar to the next lines. Enter Y and press Enter to answer the question and complete the installation process.

 Reading package lists... Done
 Building dependency tree
 Reading state information... Done
 The following additional packages will be installed:
 libc-ares2 libmosquitto1
 The following NEW packages will be installed:
 libc-ares2 libmosquitto1 mosquitto-clients
 0 upgraded, 3 newly installed, 0 to remove and 299 not upgraded.
 Need to get 138 kB of archives.
 After this operation, 332 kB of additional disk space will be used.
 Do you want to continue? [Y/n]

The last lines should include a line that says Setting up mosquitto-clients, as shown in the following lines:

 Setting up libmosquitto1:amd64 (1.4.10-0mosquitto3) ...
 Setting up mosquitto-clients (1.4.10-0mosquitto3) ...
 Processing triggers for libc-bin (2.23-0ubuntu3) ...

Run the following command to check the status for the mosquitto service that was recently installed.
```
 sudo service mosquitto status
```
The first lines of the output should be similar to the following lines with an active (running) status displayed. The details after CGroup indicate the command-line that started the service. The -c option followed by /etc/mosquitto/mosquitto.conf specifies that Mosquitto is using this configuration file.
```
 mosquitto.service - LSB: mosquitto MQTT v3.1 message broker
 Loaded: loaded (/etc/init.d/mosquitto; bad; vendor preset: enabled)
 Active: active (running)
 Docs: man:systemd-sysv-generator(8)
 CGroup: /system.slice/mosquitto.service
 └─17560 /usr/sbin/mosquitto -c /etc/mosquitto/mosquitto.conf
```
You can also run the following command to check whether the Mosquitto MQTT server is listening at the default port: 1883.
```
 netstat -an | grep 1883
```
The following lines show the results of the previous command that indicate the Mosquitto MQTT server has opened an IPv4 and an IPv6 listen socket on port 1883:
```
 tcp 0 0 0.0.0.0:1883 0.0.0.0:* LISTEN
 tcp6 0 0 :::1883 :::* LISTEN
```