docs: Update docker installation guides for /etc/docker

Added explanation that the `/etc/docker/` directory needs to be created.

Fixes: #569.

Signed-off-by: shinebayar-g <shinebayar.gansukh@gmail.com>

install/aws-installation-guide.md

@@ -1,4 +1,4 @@
-# Install Kata Containers on Amazon Web Services 
+# Install Kata Containers on Amazon Web Services
 
 * [Install and Configure AWS CLI](#install-and-configure-aws-cli)
 * [Create or Import an EC2 SSH key pair](#create-or-import-an-ec2-ssh-key-pair)

install/docker/centos-docker-install.md

@@ -37,18 +37,24 @@
 
    2. Docker `daemon.json`
 
-       Add the following definitions to `/etc/docker/daemon.json`:
+      Create docker configuration folder.
 
-       ```json
-       {
-         "default-runtime": "kata-runtime",
-         "runtimes": {
-           "kata-runtime": {
-             "path": "/usr/bin/kata-runtime"
-           }
-         }
-       }
-       ```
+      ```
+      $ sudo mkdir -p /etc/docker
+      ```
+
+      Add the following definitions to `/etc/docker/daemon.json`:
+
+      ```json
+      {
+        "default-runtime": "kata-runtime",
+        "runtimes": {
+          "kata-runtime": {
+            "path": "/usr/bin/kata-runtime"
+          }
+        }
+      }
+      ```
 
 3. Restart the Docker systemd service with the following commands:
 

install/docker/debian-docker-install.md

@@ -15,7 +15,7 @@
    >   If you wish to use a block based backend, see the options listed on https://github.com/kata-containers/documentation/issues/407.
 
    ```bash
-   $ sudo apt-get -y install apt-transport-https ca-certificates curl gnupg2 software-properties-common  
+   $ 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
@@ -28,14 +28,14 @@
 2. Configure Docker to use Kata Containers by default with **ONE** of the following methods:
 
 a. `sysVinit`
-    
+
     - with `sysVinit`, docker config is stored in `/etc/default/docker`, edit the options similar to the following:
-       
+
     ```sh
     $ sudo sh -c "echo '# specify docker runtime for kata-containers
     DOCKER_OPTS=\"-D --add-runtime kata-runtime=/usr/bin/kata-runtime --default-runtime=kata-runtime\"' >> /etc/default/docker"
     ```
-    
+
 b. systemd (this is the default and is applied automatically if you select the
       [automatic installation](https://github.com/kata-containers/documentation/tree/master/install#automatic-installation) option)
 
@@ -50,6 +50,12 @@ b. systemd (this is the default and is applied automatically if you select the
 
 c. Docker `daemon.json`
 
+    Create docker configuration folder.
+
+    ```
+    $ sudo mkdir -p /etc/docker
+    ```
+
     Add the following definitions to `/etc/docker/daemon.json`:
 
     ```json
@@ -66,7 +72,7 @@ c. Docker `daemon.json`
 3. Restart the Docker systemd service with one of the following (depending on init choice):
 
     a. `sysVinit`
-  
+
     ```sh
     $ sudo /etc/init.d/docker stop
     $ sudo /etc/init.d/docker start
@@ -77,7 +83,7 @@ c. Docker `daemon.json`
     ```sh
     $ tail -f /var/log/docker.log
     ```
-    
+
     b. systemd
 
     ```bash

install/docker/fedora-docker-install.md

@@ -39,18 +39,24 @@
 
    2. Docker `daemon.json`
 
-       Add the following definitions to `/etc/docker/daemon.json`:
+      Create docker configuration folder.
 
-       ```json
-       {
-         "default-runtime": "kata-runtime",
-         "runtimes": {
-           "kata-runtime": {
-             "path": "/usr/bin/kata-runtime"
-           }
-         }
-       }
-       ```
+      ```
+      $ sudo mkdir -p /etc/docker
+      ```
+
+      Add the following definitions to `/etc/docker/daemon.json`:
+
+      ```json
+      {
+        "default-runtime": "kata-runtime",
+        "runtimes": {
+          "kata-runtime": {
+            "path": "/usr/bin/kata-runtime"
+          }
+        }
+      }
+      ```
 
 3. Restart the Docker systemd service with the following commands:
 

install/docker/opensuse-docker-install.md

@@ -37,18 +37,24 @@
 
    2. Docker `daemon.json`
 
-       Add the following definitions to `/etc/docker/daemon.json`:
+      Create docker configuration folder.
 
-       ```json
-       {
-         "default-runtime": "kata-runtime",
-         "runtimes": {
-           "kata-runtime": {
-             "path": "/usr/bin/kata-runtime"
-           }
-         }
-       }
-       ```
+      ```
+      $ sudo mkdir -p /etc/docker
+      ```
+
+      Add the following definitions to `/etc/docker/daemon.json`:
+
+      ```json
+      {
+        "default-runtime": "kata-runtime",
+        "runtimes": {
+          "kata-runtime": {
+            "path": "/usr/bin/kata-runtime"
+          }
+        }
+      }
+      ```
 
 3. Restart the Docker systemd service with the following commands:
 

install/docker/rhel-docker-install.md

@@ -38,18 +38,24 @@
 
    2. Docker `daemon.json`
 
-       Add the following definitions to `/etc/docker/daemon.json`:
+      Create docker configuration folder.
 
-       ```json
-       {
-         "default-runtime": "kata-runtime",
-         "runtimes": {
-           "kata-runtime": {
-             "path": "/usr/bin/kata-runtime"
-           }
-         }
-       }
-       ```
+      ```
+      $ sudo mkdir -p /etc/docker
+      ```
+
+      Add the following definitions to `/etc/docker/daemon.json`:
+
+      ```json
+      {
+        "default-runtime": "kata-runtime",
+        "runtimes": {
+          "kata-runtime": {
+            "path": "/usr/bin/kata-runtime"
+          }
+        }
+      }
+      ```
 
 3. Restart the Docker systemd service with the following commands:
 

install/docker/sles-docker-install.md

@@ -36,18 +36,24 @@
 
    2. Docker `daemon.json`
 
-       Add the following definitions to `/etc/docker/daemon.json`:
+      Create docker configuration folder.
 
-       ```json
-       {
-         "default-runtime": "kata-runtime",
-         "runtimes": {
-           "kata-runtime": {
-             "path": "/usr/bin/kata-runtime"
-           }
-         }
-       }
-       ```
+      ```
+      $ sudo mkdir -p /etc/docker
+      ```
+
+      Add the following definitions to `/etc/docker/daemon.json`:
+
+      ```json
+      {
+        "default-runtime": "kata-runtime",
+        "runtimes": {
+          "kata-runtime": {
+            "path": "/usr/bin/kata-runtime"
+          }
+        }
+      }
+      ```
 
 3. Restart the Docker systemd service with the following commands:
 

install/docker/ubuntu-docker-install.md

@@ -41,18 +41,24 @@
 
    2. Docker `daemon.json`
 
-       Add the following definitions to `/etc/docker/daemon.json`:
+      Create docker configuration folder.
 
-       ```json
-       {
-         "default-runtime": "kata-runtime",
-         "runtimes": {
-           "kata-runtime": {
-             "path": "/usr/bin/kata-runtime"
-           }
-         }
-       }
-       ```
+      ```
+      $ sudo mkdir -p /etc/docker
+      ```
+
+      Add the following definitions to `/etc/docker/daemon.json`:
+
+      ```json
+      {
+        "default-runtime": "kata-runtime",
+        "runtimes": {
+          "kata-runtime": {
+            "path": "/usr/bin/kata-runtime"
+          }
+        }
+      }
+      ```
 
 3. Restart the Docker systemd service with the following commands: