docs: Pin docker to version 18.06

.ci/test-install-docs.sh

@@ -225,7 +225,18 @@ test_alternative_install_methods()
 
 run_tests()
 {
+	# If docker was installed by default, zap it.
+	$mgr -v -f remove-docker
+
 	test_distro_install_guide
+
+	# Remove docker in preparation for the next test.
+	#
+	# This is required since docker may have been pinned (to ensure a
+	# particular version is installed). But when a package is pinned, you
+	# cannot change it (although you can remove it).
+	$mgr -v -f remove-docker
+
 	test_alternative_install_methods
 }
 

install/docker/centos-docker-install.md

@@ -5,13 +5,24 @@
 > - This guide assumes you have
 >   [already installed the Kata Containers packages](../centos-installation-guide.md).
 
-1. Install the latest version of Docker with the following commands:
-
-   > **Note:** This step is only required if Docker is not installed on the system.
+1. Install Docker with the following commands:
+
+   > **Notes:**
+   >
+   > - This step is only required if Docker is not installed on the system.
+   > - Newer versions of Docker have
+   >   [removed devicemapper support](https://github.com/kata-containers/documentation/issues/373)
+   >   so the following commands install the latest version, which includes
+   >   devicemapper support.
+   > - To remove the lock on the docker package to allow it to be updated:
+   >   ```sh
+   >   $ sudo yum versionlock delete docker-ce
+   >   ```
 
    ```bash
    $ sudo yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo
-   $ sudo yum -y install docker-ce
+   $ sudo yum -y install 'docker-ce-18.06.2.ce-3*' yum-plugin-versionlock
+   $ sudo yum versionlock docker-ce
    ```
 
    For more information on installing Docker please refer to the

install/docker/debian-docker-install.md

@@ -6,16 +6,27 @@
 >   [already installed the Kata Containers packages](../debian-installation-guide.md).
 > - this guide allows for installation with `systemd` or `sysVinit` init systems
 
-1. Install the latest version of Docker with the following commands:
-
-   > **Note:** This step is only required if Docker is not installed on the system.
+1. Install Docker with the following commands:
+
+   > **Notes:**
+   >
+   > - This step is only required if Docker is not installed on the system.
+   > - Newer versions of Docker have
+   >   [removed devicemapper support](https://github.com/kata-containers/documentation/issues/373)
+   >   so the following commands install the latest version, which includes
+   >   devicemapper support.
+   > - To remove the lock on the docker package to allow it to be updated:
+   >   ```sh
+   >   $ sudo apt-mark unhold docker-ce
+   >   ```
 
    ```bash
    $ sudo apt-get -y install apt-transport-https ca-certificates curl gnupg2 software-properties-common  
    $ curl -fsSL https://download.docker.com/linux/$(. /etc/os-release; echo "$ID")/gpg | sudo apt-key add -
    $ sudo add-apt-repository "deb https://download.docker.com/linux/$(. /etc/os-release; echo "$ID") $(lsb_release -cs) stable"
    $ sudo apt-get update
-   $ sudo apt-get -y install docker-ce
+   $ sudo -E apt-get -y install --allow-downgrades docker-ce='18.06.2~ce~3-0~debian'
+   $ sudo apt-mark hold docker-ce
    ```
 
    For more information on installing Docker please refer to the

install/docker/fedora-docker-install.md

@@ -5,14 +5,28 @@
 > - This guide assumes you have
 >   [already installed the Kata Containers packages](../fedora-installation-guide.md).
 
-1. Install the latest version of Docker with the following commands:
-
-   > **Note:** This step is only required if Docker is not installed on the system.
+1. Install Docker with the following commands:
+
+   > **Notes:**
+   >
+   > - This step is only required if Docker is not installed on the system.
+   > - Newer versions of Docker have
+   >   [removed devicemapper support](https://github.com/kata-containers/documentation/issues/373)
+   >   so the following commands install the latest version, which includes
+   >   devicemapper support.
+   > - To remove the lock on the docker package to allow it to be updated:
+   >   ```sh
+   >   $ sudo dnf versionlock delete docker-ce
+   >   ```
 
    ```bash
+   $ source /etc/os-release
    $ sudo dnf config-manager --add-repo https://download.docker.com/linux/fedora/docker-ce.repo
    $ sudo dnf makecache
-   $ sudo dnf -y install docker-ce
+   $ docker_pkg='docker-ce-18.06.2.ce-3*'
+   $ [ "$VERSION_ID" -gt 28 ] && docker_pkg=docker-ce
+   $ sudo dnf -y install $docker_pkg python3-dnf-plugin-versionlock
+   $ sudo dnf versionlock docker-ce
    ```
 
    For more information on installing Docker please refer to the

install/docker/opensuse-docker-install.md

@@ -5,13 +5,24 @@
 > - This guide assumes you have
 >   [already installed the Kata Containers packages](../opensuse-installation-guide.md).
 
-1. Install the latest version of Docker with the following commands:
-
-   > **Note:** This step is only required if Docker is not installed on the system.
+1. Install Docker with the following commands:
+
+   > **Notes:**
+   >
+   > - This step is only required if Docker is not installed on the system.
+   > - Newer versions of Docker have
+   >   [removed devicemapper support](https://github.com/kata-containers/documentation/issues/373)
+   >   so the following commands install the latest version, which includes
+   >   devicemapper support.
+   > - To remove the lock on the docker package to allow it to be updated:
+   >   ```sh
+   >   $ sudo zypper removelock docker
+   >   ```
 
    ```bash
    $ sudo zypper -n install libcgroup1
-   $ sudo zypper -n install docker
+   $ sudo zypper -n install 'docker<18.09'
+   $ sudo zypper addlock docker
    ```
 
    For more information on installing Docker please refer to the

install/docker/sles-docker-install.md

@@ -5,12 +5,23 @@
 > - This guide assumes you have
 >   [already installed the Kata Containers packages](../sles-installation-guide.md).
 
-1. Install the latest version of Docker with the following commands:
-
-   > **Note:** This step is only required if Docker is not installed on the system.
+1. Install Docker with the following commands:
+
+   > **Notes:**
+   >
+   > - This step is only required if Docker is not installed on the system.
+   > - Newer versions of Docker have
+   >   [removed devicemapper support](https://github.com/kata-containers/documentation/issues/373)
+   >   so the following commands install the latest version, which includes
+   >   devicemapper support.
+   > - To remove the lock on the docker package to allow it to be updated:
+   >   ```sh
+   >   $ sudo zypper removelock docker
+   >   ```
 
    ```bash
-   $ sudo zypper -n install docker
+   $ sudo zypper -n install 'docker<18.09'
+   $ sudo zypper addlock docker
    ```
 
    For more information on installing Docker please refer to the

install/docker/ubuntu-docker-install.md

@@ -5,17 +5,28 @@
 > - This guide assumes you have
 >   [already installed the Kata Containers packages](../ubuntu-installation-guide.md).
 
-1. Install the latest version of Docker with the following commands:
-
-   > **Note:** This step is only required if Docker is not installed on the system.
+1. Install Docker with the following commands:
+
+   > **Notes:**
+   >
+   > - This step is only required if Docker is not installed on the system.
+   > - Newer versions of Docker have
+   >   [removed devicemapper support](https://github.com/kata-containers/documentation/issues/373)
+   >   so the following commands install the latest version, which includes
+   >   devicemapper support.
+   > - To remove the lock on the docker package to allow it to be updated:
+   >   ```sh
+   >   $ sudo apt-mark unhold docker-ce
+   >   ```
 
    ```bash
    $ sudo -E apt-get -y install apt-transport-https ca-certificates software-properties-common
    $ curl -sL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -
    $ arch=$(dpkg --print-architecture)
    $ sudo -E add-apt-repository "deb [arch=${arch}] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable"
    $ sudo -E apt-get update
-   $ sudo -E apt-get -y install docker-ce
+   $ sudo -E apt-get -y install --allow-downgrades docker-ce='18.06.2~ce~3-0~ubuntu'
+   $ sudo apt-mark hold docker-ce
    ```
 
    For more information on installing Docker please refer to the