diff --git a/docs/developer_info/Docker-Config_Understanding.rst b/docs/developer_info/Docker-Config_Understanding.rst
new file mode 100644
index 0000000..e684c6c
--- /dev/null
+++ b/docs/developer_info/Docker-Config_Understanding.rst
@@ -0,0 +1,364 @@
+.. This work is licensed under a Creative Commons Attribution 4.0 International License.
+.. http://creativecommons.org/licenses/by/4.0
+.. Copyright 2020 Huawei Technologies Co., Ltd.
+
+Docker-config
+=============
+
+In SO (Service Orchestration) every component running on docker engine and respective containers. here we can see how so is working with Dokcer.
+
+CA(Certificate Authority)
+=========================
+
+Certificate Authorities/ CAs, issue Digital Certificates. Digital Certificates are verifiable small data files that contain identity credentials to help websites, people, and devices represent their authentic online identity (authentic because the CA has verified the identity). CAs play a critical role in how the Internet operates and how transparent, trusted transactions can take place online. CAs issue millions of Digital Certificates each year, and these certificates are used to protect information, encrypt billions of transactions, and enable secure communication.
+
+CA(file)
+
+/so/packages/docker/src/main/docker/docker-files/ca-certificates/onap-ca.crt
+
+Example CA cirtifiacte:-
+
+-----BEGIN CERTIFICATE-----
+MIIEczCCA1ugAwIBAgIBADANBgkqhkiG9w0BAQQFAD..AkGA1UEBhMCR0Ix
+EzARBgNVBAgTClNvbWUtU3RhdGUxFDASBgNVBAoTC0..0EgTHRkMTcwNQYD
+VQQLEy5DbGFzcyAxIFB1YmxpYyBQcmltYXJ5IENlcn..XRpb24gQXV0aG9y
+aXR5MRQwEgYDVQQDEwtCZXN0IENBIEx0ZDAeFw0wMD..TUwMTZaFw0wMTAy
+MDQxOTUwMTZaMIGHMQswCQYDVQQGEwJHQjETMBEGA1..29tZS1TdGF0ZTEU
+MBIGA1UEChMLQmVzdCBDQSBMdGQxNzA1BgNVBAsTLk..DEgUHVibGljIFBy
+aW1hcnkgQ2VydGlmaWNhdGlvbiBBdXRob3JpdHkxFD..AMTC0Jlc3QgQ0Eg
+THRkMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCg..Tz2mr7SZiAMfQyu
+vBjM9OiJjRazXBZ1BjP5CE/Wm/Rr500PRK+Lh9x5eJ../ANBE0sTK0ZsDGM
+ak2m1g7oruI3dY3VHqIxFTz0Ta1d+NAjwnLe4nOb7/..k05ShhBrJGBKKxb
+8n104o/5p8HAsZPdzbFMIyNjJzBM2o5y5A13wiLitE..fyYkQzaxCw0Awzl
+kVHiIyCuaF4wj571pSzkv6sv+4IDMbT/XpCo8L6wTa..sh+etLD6FtTjYbb
+rvZ8RQM1tlKdoMHg2qxraAV++HNBYmNWs0duEdjUbJ..XI9TtnS4o1Ckj7P
+OfljiQIDAQABo4HnMIHkMB0GA1UdDgQWBBQ8urMCRL..5AkIp9NJHJw5TCB
+tAYDVR0jBIGsMIGpgBQ8urMCRLYYMHUKU5AkIp9NJH..aSBijCBhzELMAkG
+A1UEBhMCR0IxEzARBgNVBAgTClNvbWUtU3RhdGUxFD..AoTC0Jlc3QgQ0Eg
+THRkMTcwNQYDVQQLEy5DbGFzcyAxIFB1YmxpYyBQcm..ENlcnRpZmljYXRp
+b24gQXV0aG9yaXR5MRQwEgYDVQQDEwtCZXN0IENBIE..DAMBgNVHRMEBTAD
+AQH/MA0GCSqGSIb3DQEBBAUAA4IBAQC1uYBcsSncwA..DCsQer772C2ucpX
+xQUE/C0pWWm6gDkwd5D0DSMDJRqV/weoZ4wC6B73f5..bLhGYHaXJeSD6Kr
+XcoOwLdSaGmJYslLKZB3ZIDEp0wYTGhgteb6JFiTtn..sf2xdrYfPCiIB7g
+BMAV7Gzdc4VspS6ljrAhbiiawdBiQlQmsBeFz9JkF4..b3l8BoGN+qMa56Y
+It8una2gY4l2O//on88r5IWJlm1L0oA8e4fR2yrBHX..adsGeFKkyNrwGi/
+7vQMfXdGsRrXNGRGnX+vWDZ3/zWI0joDtCkNnqEpVn..HoX
+-----END CERTIFICATE-----
+
+
+Configurations:-
+================
+
+Every component has its own over-ride yaml file. We can over-ride the file according the Configurations and Dependencies required for Deploying. 
+
+Over-ride yaml for api-handler
+==============================
+
+Path:- /docker-config/volumes/so/config/api-handler-infra/onapheat/override.yaml
+
+.. code-block:: bash
+
+ server:
+    port: 8080
+    tomcat:
+        max-threads: 50
+ ssl-enable: false
+
+ mso:
+  msoKey: 07a7159d3bf51a0e53be7a8f89699be7
+  logPath: logs
+  site-name: onapheat
+  adapters:
+    requestDb:
+      endpoint: http://request-db-adapter:8083
+      auth: Basic YnBlbDpwYXNzd29yZDEk
+  catalog:
+    db:
+      spring:
+        endpoint: http://catalog-db-adapter:8082
+  db:
+    auth: Basic YnBlbDpwYXNzd29yZDEk
+  config:
+    path: /src/main/resources/
+  infra:
+    default:
+      alacarte:
+        orchestrationUri: /mso/async/services/ALaCarteOrchestrator
+        recipeTimeout: 180
+        testApi: VNF_API
+      service:
+        macro:
+          default:
+            testApi: GR_API
+  camundaURL: http://bpmn-infra:8081
+  camundaAuth: AE2E9BE6EF9249085AF98689C4EE087736A5500629A72F35068FFB88813A023581DD6E765071F1C04075B36EA4213A
+  async:
+    core-pool-size: 50
+    max-pool-size: 50
+    queue-capacity: 500
+  sdc:
+    client:
+      auth: F3473596C526938329DF877495B494DC374D1C4198ED3AD305EA3ADCBBDA1862
+    activate:
+      instanceid: test
+      userid: cs0008
+    endpoint: http://c1.vm1.mso.simpledemo.onap.org:28090
+  tenant:
+    isolation:
+      retry:
+        count: 3
+  aai:
+    endpoint: https://aai.api.simpledemo.onap.org:8443
+    auth: 2630606608347B7124C244AB0FE34F6F
+  extApi:
+    endpoint: http://nbi.onap:8080/nbi/api/v3
+  so:
+    operational-environment:
+      dmaap:
+        username: testuser
+        password: VjR5NDcxSzA=
+        host: http://c1.vm1.mso.simpledemo.onap.org:28090
+        auth: 51EA5414022D7BE536E7516C4D1A6361416921849B72C0D6FC1C7F262FD9F2BBC2AD124190A332D9845A188AD80955567A4F975C84C221EEA8243BFD92FFE6896CDD1EA16ADD34E1E3D47D4A
+      publisher:
+        topic: com.att.ecomp.mso.operationalEnvironmentEvent
+
+ spring:
+  datasource:
+    hikari:
+      jdbcUrl: jdbc:mariadb://mariadb:3306/catalogdb
+      username: cataloguser
+      password: catalog123
+      driver-class-name: org.mariadb.jdbc.Driver
+      pool-name: catdb-pool
+      registerMbeans: true
+  jpa:
+      show-sql: true
+      hibernate:
+        dialect: org.hibernate.dialect.MySQL5Dialect
+        ddl-auto: validate
+        naming-strategy: org.hibernate.cfg.ImprovedNamingStrategy
+        enable-lazy-load-no-trans: true
+  jersey:
+    type: filter
+
+  security:
+    usercredentials:
+    -
+      username: sitecontrol
+      password: '$2a$10$Fh9ffgPw2vnmsghsRD3ZauBL1aKXebigbq3BB1RPWtE62UDILsjke'
+      role: SiteControl-Client
+    -
+      username: gui
+      password: '$2a$10$Fh9ffgPw2vnmsghsRD3ZauBL1aKXebigbq3BB1RPWtE62UDILsjke'
+      role: GUI-Client
+    -
+      username: infraportal
+      password: '$2a$10$Fh9ffgPw2vnmsghsRD3ZauBL1aKXebigbq3BB1RPWtE62UDILsjke'
+      role: InfraPortal-Client
+    -
+      username: InfraPortalClient
+      password: '$2a$10$Fh9ffgPw2vnmsghsRD3ZauBL1aKXebigbq3BB1RPWtE62UDILsjke'
+      role: InfraPortal-Client
+    -
+      username: bpel
+      password: '$2a$10$Fh9ffgPw2vnmsghsRD3ZauBL1aKXebigbq3BB1RPWtE62UDILsjke'
+      role: BPEL-Client
+    -
+      username: mso_admin
+      password: '$2a$10$Fh9ffgPw2vnmsghsRD3ZauBL1aKXebigbq3BB1RPWtE62UDILsjke'
+      role: ACTUATOR
+
+ request:
+  datasource:
+    hikari:
+      jdbcUrl: jdbc:mariadb://mariadb:3306/requestdb
+      username: requestuser
+      password: request123
+      driver-class-name: org.mariadb.jdbc.Driver
+      pool-name: reqdb-pool
+      registerMbeans: true
+ org:
+  onap:
+    so:
+      cloud-owner: CloudOwner
+      adapters:
+        network:
+          encryptionKey: 07a7159d3bf51a0e53be7a8f89699be7
+
+
+
+Start the  container
+=======================
+cd /home/root1/docker-config/
+
+CMD:-
+===
+
+sudo docker-compose up -d 
+
+*Example Output:*
+
+root1@slave-node:~/docker-config$ sudo docker-compose up -d 
+docker-config_mariadb_1 is up-to-date
+Starting docker-config_catalog-db-adapter_1 ... done
+Starting docker-config_request-db-adapter_1 ... done
+Starting docker-config_bpmn-infra_1         ... done
+Starting docker-config_vfc-adapter_1        ... done
+Starting docker-config_sdc-controller_1     ... done
+Starting docker-config_sdnc-adapter_1       ... done
+Starting docker-config_openstack-adapter_1  ... done
+Starting docker-config_api-handler-infra_1  ... done
+Starting docker-config_so-monitoring_1      ... done
+Starting docker-config_nssmf-adapter_1      ... done
+
+
+Example Output:
+===============
+
+docker ps
+
+*Example Output:*
+
+root1@slave-node:~/docker-config$ sudo docker ps
+CONTAINER ID        IMAGE                                              COMMAND                  CREATED             STATUS              PORTS                     NAMES
+d930caf28508        nexus3.onap.org:10001/onap/so/openstack-adapter    "/app/wait-for.sh -q…"   5 weeks ago         Up 30 seconds       0.0.0.0:8087->8087/tcp    docker-config_openstack-adapter_1
+599af283319e        nexus3.onap.org:10001/onap/so/vfc-adapter          "/app/wait-for.sh -q…"   5 weeks ago         Up 30 seconds       0.0.0.0:8084->8084/tcp    docker-config_vfc-adapter_1
+5549305c8dd6        nexus3.onap.org:10001/onap/so/api-handler-infra    "/app/wait-for.sh -q…"   5 weeks ago         Up 27 seconds       0.0.0.0:8080->8080/tcp    docker-config_api-handler-infra_1
+59d3aa684ecb        nexus3.onap.org:10001/onap/so/sdnc-adapter         "/app/wait-for.sh -q…"   5 weeks ago         Up 29 seconds       0.0.0.0:8086->8086/tcp    docker-config_sdnc-adapter_1
+ade4cef97bd3        nexus3.onap.org:10001/onap/so/bpmn-infra           "/app/wait-for.sh -q…"   5 weeks ago         Up 29 seconds       0.0.0.0:8081->8081/tcp    docker-config_bpmn-infra_1
+e9558560c4d7        nexus3.onap.org:10001/onap/so/sdc-controller       "/app/wait-for.sh -q…"   5 weeks ago         Up 25 seconds       0.0.0.0:8085->8085/tcp    docker-config_sdc-controller_1
+ae27ec2f8b04        nexus3.onap.org:10001/onap/so/so-monitoring        "/app/wait-for.sh -q…"   5 weeks ago         Up 26 seconds       0.0.0.0:8088->8088/tcp    docker-config_so-monitoring_1
+8d2c64d48f1a        nexus3.onap.org:10001/onap/so/request-db-adapter   "/app/wait-for.sh -q…"   5 weeks ago         Up 32 seconds       0.0.0.0:8083->8083/tcp    docker-config_request-db-adapter_1
+a126dd29c540        nexus3.onap.org:10001/mariadb:10.1.11              "/docker-entrypoint.…"   5 weeks ago         Up 17 minutes       0.0.0.0:32768->3306/tcp   docker-config_mariadb_1
+
+Inspect a docker image
+======================
+This command shows interesting information about the structure of the mso image. Note that an image is NOT a running container. It is the template that a container is created from.
+
+CMD:-
+=====
+sudo docker inspect onap/so/api-handler-infra
+
+
+Example Output:
+
+.. code-block:: bash
+
+
+ [
+  {
+      "Id": "sha256:2573165483e9ac87826da9c08984a9d0e1d93a90c681b22d9b4f90ed579350dc",
+      "RepoTags": [
+          "onap/so/api-handler-infra:1.3.0-SNAPSHOT",
+          "onap/so/api-handler-infra:1.3.0-SNAPSHOT-20190213T0846",
+          "onap/so/api-handler-infra:1.3.0-SNAPSHOT-latest",
+          "onap/so/api-handler-infra:latest"
+      ],
+      "RepoDigests": [],
+      "Parent": "sha256:66b508441811ab4ed9968f8702a0d0a697f517bbc10d8d9076e5b98ae4437344",
+      "Comment": "",
+      "Created": "2019-02-13T09:37:33.770342225Z",
+      "Container": "8be46c735d21935631130f9017c3747779aab26eab54a9149b1edde122f7576d",
+      "ContainerConfig": {
+          "Hostname": "ac4a12e21390",
+          "Domainname": "",
+          "User": "",
+          "AttachStdin": false,
+          "AttachStdout": false,
+          "AttachStderr": false,
+          "Tty": false,
+          "OpenStdin": false,
+          "StdinOnce": false,
+          "Env": [
+              "PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/lib/jvm/java-1.8-openjdk/jre/bin:/usr/lib/jvm/java-1.8-openjdk/bin",
+              "LANG=C.UTF-8",
+              "JAVA_HOME=/usr/lib/jvm/java-1.8-openjdk",
+              "JAVA_VERSION=8u191",
+              "JAVA_ALPINE_VERSION=8.191.12-r0",
+              "HTTP_PROXY=",
+              "HTTPS_PROXY=",
+              "http_proxy=",
+              "https_proxy="
+          ],
+          "Cmd": [
+              "/bin/sh",
+              "-c",
+              "#(nop) ",
+              "CMD [\"/app/start-app.sh\"]"
+          ],
+          "ArgsEscaped": true,
+          "Image": "sha256:66b508441811ab4ed9968f8702a0d0a697f517bbc10d8d9076e5b98ae4437344",
+          "Volumes": {
+              "/app/ca-certificates": {},
+              "/app/config": {}
+          },
+          "WorkingDir": "/app",
+          "Entrypoint": null,
+          "OnBuild": [],
+          "Labels": {}
+      },
+      "DockerVersion": "17.05.0-ce",
+      "Author": "",
+      "Config": {
+          "Hostname": "ac4a12e21390",
+          "Domainname": "",
+          "User": "",
+          "AttachStdin": false,
+          "AttachStdout": false,
+          "AttachStderr": false,
+          "Tty": false,
+          "OpenStdin": false,
+          "StdinOnce": false,
+          "Env": [
+              "PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/lib/jvm/java-1.8-openjdk/jre/bin:/usr/lib/jvm/java-1.8-openjdk/bin",
+              "LANG=C.UTF-8",
+              "JAVA_HOME=/usr/lib/jvm/java-1.8-openjdk",
+              "JAVA_VERSION=8u191",
+              "JAVA_ALPINE_VERSION=8.191.12-r0",
+              "HTTP_PROXY=",
+              "HTTPS_PROXY=",
+              "http_proxy=",
+              "https_proxy="
+          ],
+          "Cmd": [
+              "/app/start-app.sh"
+          ],
+          "ArgsEscaped": true,
+          "Image": "sha256:66b508441811ab4ed9968f8702a0d0a697f517bbc10d8d9076e5b98ae4437344",
+          "Volumes": {
+              "/app/ca-certificates": {},
+              "/app/config": {}
+          },
+          "WorkingDir": "/app",
+          "Entrypoint": null,
+          "OnBuild": [],
+          "Labels": {}
+      },
+      "Architecture": "amd64",
+      "Os": "linux",
+      "Size": 245926705,
+      "VirtualSize": 245926705,
+      "GraphDriver": {
+          "Data": null,
+          "Name": "aufs"
+      },
+      "RootFS": {
+          "Type": "layers",
+          "Layers": [
+              "sha256:503e53e365f34399c4d58d8f4e23c161106cfbce4400e3d0a0357967bad69390",
+              "sha256:744b4cd8cf79c70508aace3697b6c3b46bee2c14f1c14b6ff09fd0ba5735c6d4",
+              "sha256:4c6899b75fdbea2f44efe5a2f8d9f5319c1cf7e87151de0de1014aba6ce71244",
+              "sha256:2e076d24f6d1277456e33e58fc8adcfd69dfd9c025f61aa7b98d500e7195beb2",
+              "sha256:bb67f2d5f8196c22137a9e98dd4190339a65c839822d16954070eeb0b2a17aa2",
+              "sha256:afbbd0cc43999d5c5b0ff54dfd82365a3feb826e5c857d9b4a7cf378001cd4b3",
+              "sha256:1920a7ca0f8ae38a79a1339ce742aaf3d7a095922d96e37074df67cf031d5035",
+              "sha256:1261fbaef67c5be677dae1c0f50394587832ea9d8c7dc105df2f3db6dfb92a3a",
+              "sha256:a33d8ee5c18908807458ffe643184228c21d3c5d5c5df1251f0f7dfce512f7e8",
+              "sha256:80704fca12eddb4cc638cee105637266e04ab5706b4e285d4fc6cac990e96d63",
+              "sha256:55abe39073a47f29aedba790a92c351501f21b3628414fa49a073c010ee747d1",
+              "sha256:cc4136c2c52ad522bd492545d4dd18265676ca690aa755994adf64943b119b28",
+              "sha256:2163a1f989859fdb3af6e253b74094e92a0fc1ee59f5eb959971f94eb1f98094"
+          ]
+      }
+  }
+ ]
diff --git a/docs/developer_info/developer_information.rst b/docs/developer_info/developer_information.rst
index a060da6..85e7010 100644
--- a/docs/developer_info/developer_information.rst
+++ b/docs/developer_info/developer_information.rst
@@ -20,6 +20,7 @@
    BPMN_Subprocess_Process_Flows.rst
    BPMN_Project_Deployment_Strategy.rst
    BPMN-INFRA_Workflow_Understanding.rst
+   Docker-Config_Understanding.rst
    Mso_Openstack_Adapter.rst
    Cxf_Logging.rst
    instantiate/index.rst