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Image
From this blog, typescript feature will be added. There are couple of ways to implement static type checking like; flow from facebook, PropTypes and Typescript. Typescript is well integrated with Visual Studio Code and supports better linter, error messages, and intellisense. Reference site Github Sample Ex4 Currnet version D:\GitRepo\reactnative>npm --version 6.3.0 D:\GitRepo\reactnative>react-native --version react-native-cli: 2.0.1 react-native: n/a - not inside a React Native project directory D:\GitRepo\reactnative>yarn --version 1.9.4 Creating React Native App $ react-native init ex4 If you want to specify the version, add "--version 0.57.3" at the end. Add NativeBase to React Native $ npm install native-base --save ... + native-base@2.8.1 added 71 packages from 42 contributors, removed 50 packages, updated 829 packages and audited 34989 packages in 138.542s found 0 vulnerabilities $ $ yarn yarn install v1.9.4 warning package-lock.json found. You...
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Automation with Ansible(8) - Running command on Remote computer

Running command on remote

I need to run commands from remote and due to the password prompts, there was a challenge on it. To do this, "pexpect" module should be installed on the remote target computer.

Prerequestic

  • "pip" program on remote computer
  • Need to install pexpect using pip program

In my case, remote computer name is "docker01" and local computer name is "ns01". However, I recommend to install "pexpect" package on both computer

Reference

Install pip and pexpect module

[root@docker01 ansible]#  yum install epel-release                                                                             Installing : epel-release-7-9.noarch   1/1 
  Installed:                                                                                                               
    epel-release.noarch 0:7-9                                                                                                ...

Complete!                                         
[root@docker01 ansible]# yum -y install python-pip                                                                           Installed:                                                                                                                     python2-pip.noarch 0:8.1.2-6.el7                                                                                           Dependency Installed:                                                                                                                                           
  python-backports.x86_64 0:1.0-8.el7         python-backports-ssl_match_hostname.noarch 0:3.4.0.2-4.el7         python-setuptools.noarch 0:0.9.8-7.el7     
....                                    
Complete! 

[root@docker01 ansible]# pip install --upgrade pip
Collecting pip
  Downloading https://files.pythonhosted.org/packages/0f/74/ecd13431bcc456ed390b44c8a6e917c1820365cbebcb6a8974d1cd045ab4/pip-10.0.1-py2.py3-none-any.whl (1.3MB)
    100% |████████████████████████████████| 1.3MB 696kB/s
Installing collected packages: pip
  Found existing installation: pip 8.1.2
    Uninstalling pip-8.1.2:
      Successfully uninstalled pip-8.1.2
Successfully installed pip-10.0.1

[root@docker01 ansible]# pip install pexpect
Collecting pexpect
  Downloading https://files.pythonhosted.org/packages/b9/3c/e51a76fe78a877afd9acd95a51e3b7610c0983b19ef5a5dfa11735a619b8/pexpect-4.5.0-py2.py3-none-any.whl (57kB)
    100% |████████████████████████████████| 61kB 745kB/s
Collecting ptyprocess>=0.5 (from pexpect)
  Downloading https://files.pythonhosted.org/packages/ff/4e/fa4a73ccfefe2b37d7b6898329e7dbcd1ac846ba3a3b26b294a78a3eb997/ptyprocess-0.5.2-py2.py3-none-any.whl
Installing collected packages: ptyprocess, pexpect
Successfully installed pexpect-4.5.0 ptyprocess-0.5.2

Running command from ansible

During SSH process, two questions can be asked; 1. adding to known hosts with (yes/no) question 2. providing password on remote. From the second question, I used only yes as a question. If you enter without quote on the yes string, it will consider as true/false and will be replaced with True. Please make sure to add quote to the word.

---
- hosts: docker-manager-first
  remote_user: root
  pre_tasks:
    - include_tasks: tasks/load-vars.yml
  become: yes
  become_method: sudo
  tasks:
  - name: Get service list from Docker Manager node
    become: yes
    expect:
      command: ssh root@{{DockerManagerNode}} "docker service ls"
      responses:
        "password": "password"
        "yes": "yes"
    register: dockerSwarmServiceList

  - debug:
      var: dockerSwarmServiceList

Ansibleplaybook result

[ansible@ns01 ansible]$ ansible-playbook -vvvv -i inventory/test/internal/cicd_list DeployMicroservices-Test.yaml    --extra-vars " ansible_sudo_pass=password" --ask-pass
No config file found; using defaults
SSH password:

PLAYBOOK: DeployMicroservices-Test.yaml *************************************************************************************************************************

1 plays in DeployMicroservices-Test.yaml

PLAY [docker-manager-first] *************************************************************************************************************************************


TASK [Gathering Facts] ******************************************************************************************************************************************

changed: [docker01] => {
    "changed": true,
    "cmd": "ssh root@docker01 \"docker service ls\"",
    "delta": "0:00:00.630777",
    "end": "2018-04-20 11:50:18.596127",
    "invocation": {
        "module_args": {
            "chdir": null,
            "command": "ssh root@docker01 \"docker service ls\"",
            "creates": null,
            "echo": false,
            "removes": null,
            "responses": {
                "password": "Flans7860",
                "yes": "yes"
            },
            "timeout": 30
        }
    },
    "rc": 0,
    "start": "2018-04-20 11:50:17.965350",
    "stdout": "The authenticity of host 'docker01 (10.200.0.150)' can't be established.\r\nECDSA key fingerprint is SHA256:cESEZr5cIIDf+uqksrYo+G34m5xm3gu6irysqQbLGN0.\r\nECDSA key fingerprint is MD5:01:7c:8e:b8:15:06:ef:c7:06:8f:b9:3b:f8:9d:9e:23.\r\nAre you sure you want to continue connecting (yes/no)? \r\nWarning: Permanently added 'docker01,10.200.0.150' (ECDSA) to the list of known hosts.\r\r\nroot@docker01's password: \r\nID                  NAME
            MODE                REPLICAS            IMAGE                                                        PORTS\r\n422dsl8pj2vo        artifactorystack_artifactory              replicated          1/1                 docker.bintray.io/jfrog/artifactory-oss:latest               *:49200->8081/tcp\r\nj5ayxacd8znf
    artifactorystack_postgresql               replicated          1/1                 postgres:latest                                              *:49201->5432/tcp\r\nk4nfcp42fpkr        exactcalllogservice_exactcalllogservice   replicated          0/1                 harbor.svctest.flair.local/test/exactcalllogservice:latest   *:49203->8080/tcp",
    "stdout_lines": [
        "The authenticity of host 'docker01 (10.200.0.150)' can't be established.",
        "ECDSA key fingerprint is SHA256:cESEZr5cIIDf+uqksrYo+G34m5xm3gu6irysqQbLGN0.",
        "ECDSA key fingerprint is MD5:01:7c:8e:b8:15:06:ef:c7:06:8f:b9:3b:f8:9d:9e:23.",
        "Are you sure you want to continue connecting (yes/no)? ",
        "Warning: Permanently added 'docker01,10.200.0.150' (ECDSA) to the list of known hosts.",
        "",
        "root@docker01's password: ",
        "ID                  NAME                                      MODE                REPLICAS            IMAGE
           PORTS",
        "422dsl8pj2vo        artifactorystack_artifactory              replicated          1/1                 docker.bintray.io/jfrog/artifactory-oss:latest
           *:49200->8081/tcp",
        "j5ayxacd8znf        artifactorystack_postgresql               replicated          1/1                 postgres:latest
           *:49201->5432/tcp",
        "k4nfcp42fpkr        exactcalllogservice_exactcalllogservice   replicated          0/1                 harbor.svctest.flair.local/test/exactcalllogservice:latest   *:49203->8080/tcp"
    ]
}

TASK [debug] ****************************************************************************************************************************************************

task path: /home/ansible/repo/ansible/DeployMicroservices-Test.yaml:18
ok: [docker01] => {
    "dockerSwarmServiceList": {
        "changed": true,
        "cmd": "ssh root@docker01 \"docker service ls\"",
        "delta": "0:00:00.630777",
        "end": "2018-04-20 11:50:18.596127",
        "failed": false,
        "rc": 0,
        "start": "2018-04-20 11:50:17.965350",
        "stdout": "The authenticity of host 'docker01 (10.200.0.150)' can't be established.\r\nECDSA key fingerprint is SHA256:cESEZr5cIIDf+uqksrYo+G34m5xm3gu6irysqQbLGN0.\r\nECDSA key fingerprint is MD5:01:7c:8e:b8:15:06:ef:c7:06:8f:b9:3b:f8:9d:9e:23.\r\nAre you sure you want to continue connecting (yes/no)? \r\nWarning: Permanently added 'docker01,10.200.0.150' (ECDSA) to the list of known hosts.\r\r\nroot@docker01's password: \r\nID                  NAME
                MODE                REPLICAS            IMAGE                                                        PORTS\r\n422dsl8pj2vo        artifactorystack_artifactory              replicated          1/1                 docker.bintray.io/jfrog/artifactory-oss:latest               *:49200->8081/tcp\r\nj5ayxacd8znf
        artifactorystack_postgresql               replicated          1/1                 postgres:latest                                              *:49201->5432/tcp\r\nk4nfcp42fpkr        exactcalllogservice_exactcalllogservice   replicated          0/1                 harbor.svctest.flair.local/test/exactcalllogservice:latest   *:49203->8080/tcp",
        "stdout_lines": [
            "The authenticity of host 'docker01 (10.200.0.150)' can't be established.",
            "ECDSA key fingerprint is SHA256:cESEZr5cIIDf+uqksrYo+G34m5xm3gu6irysqQbLGN0.",
            "ECDSA key fingerprint is MD5:01:7c:8e:b8:15:06:ef:c7:06:8f:b9:3b:f8:9d:9e:23.",
            "Are you sure you want to continue connecting (yes/no)? ",
            "Warning: Permanently added 'docker01,10.200.0.150' (ECDSA) to the list of known hosts.",
            "",
            "root@docker01's password: ",
            "ID                  NAME                                      MODE                REPLICAS            IMAGE
               PORTS",
            "422dsl8pj2vo        artifactorystack_artifactory              replicated          1/1                 docker.bintray.io/jfrog/artifactory-oss:latest
               *:49200->8081/tcp",
            "j5ayxacd8znf        artifactorystack_postgresql               replicated          1/1                 postgres:latest
               *:49201->5432/tcp",
            "k4nfcp42fpkr        exactcalllogservice_exactcalllogservice   replicated          0/1                 harbor.svctest.flair.local/test/exactcalllogservice:latest   *:49203->8080/tcp"
        ]
    }
}
META: ran handlers
META: ran handlers

PLAY RECAP ******************************************************************************************************************************************************

docker01                   : ok=9    changed=1    unreachable=0    failed=0

[ansible@ns01 ansible]$

Summary

Fact can't be used from another task. Only fact can be used from sub-task under same inventory definition. Due to this reason, we may want to run command to remoet computer directly and this show how to do it. Next tutorial will look at how Vault feature can be used with this to make more secure on password.

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