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Docker build

 The `docker build` command is used to build Docker images from a `Dockerfile`. This command automates the process of creating a Docker image by executing the instructions defined in the Dockerfile. Let’s break down the internal workings of `docker build` step by step: --- ### 1. **What is `docker build`?** The `docker build` command creates a Docker image from a **Dockerfile**, which is a text file that contains a series of instructions on how to assemble the image. The process takes the base image, applies modifications step-by-step (such as adding files, installing packages, or setting environment variables), and creates a final image that can be used to run containers. ### 2. **Command Syntax** ```bash docker build [OPTIONS] PATH | URL | - ``` - **PATH**: This is the path to the directory containing the `Dockerfile`. It can also be a URL or `-` (for reading from stdin). - **OPTIONS**: There are several options available, like `-t` for tagging, `--file` for specifying a differen...
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Docker images

 When you work with Docker images, several internal processes and components come into play. Docker images are the building blocks for Docker containers, and understanding how they work internally can help you optimize and troubleshoot your workflows. Here's a breakdown of how **Docker images** work internally: ### 1. **What is a Docker Image?** A **Docker image** is a lightweight, portable, and executable package that contains all the instructions and dependencies needed to run an application in a Docker container. It consists of: - **File system layers**: These layers represent filesystem changes, such as added files, directories, or changed files. - **Metadata**: Information such as the base image, environment variables, exposed ports, and default command (`CMD`). - **Instructions**: Instructions such as `FROM`, `COPY`, `RUN`, `CMD`, etc., which define how the image is built. ### 2. **How Docker Images are Built** Docker images are typically built using a **Dockerfile**, which d...
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Kubectl get pods

 When you run the command `kubectl get pods`, it triggers a series of internal steps that involve interacting with the Kubernetes API server, querying the cluster’s state, and presenting the data back to you. Let’s break down the detailed internal workings of this command: ### 1. **Parsing the Command** When you type `kubectl get pods`, the `kubectl` CLI tool first **parses the command** to understand the action you want to perform. - **`kubectl`**: The command-line tool that communicates with a Kubernetes cluster. - **`get`**: The operation, which tells `kubectl` to retrieve information. - **`pods`**: The resource type that you want to query (in this case, Kubernetes Pods). Internally, `kubectl` checks the following: - Is the action (`get`) valid for `pods`? - If any additional arguments or flags (e.g., namespace, labels) are provided, `kubectl` will adjust the query accordingly. ### 2. **Authentication & Configuration** Before making the request, `kubectl` **checks your confi...
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Create wcs instance

      Create WCS instance ·        Log in to WCS server as wcsadmin. ·        Open the following file /opt/IBM/WebSphere/CommmerceServer80/schema/oracle/wcs.data.sql ·        Replace INSERT INTO dmelementnvp (dmelement_id, name, value) select i,n,v from (SELECT dmelement_id, 'socialActivityType', '*' FROM dmelement WHERE dmeletemplate_id IN (160, 215) UNION ALL SELECT dmelement_id, 'comparison', 'any' FROM dmelement WHERE dmeletemplate_id IN (160, 215)) s (i,n,v) where not exists (select 1 from dmelementnvp where dmelement_id = i and name = n and value = v);   With: INSERT INTO dmelementnvp (dmelement_id, name, value) select i,n,v from (SELECT dmelement_id i, 'socialActivityType' n, '*' v FROM dmelement WHERE dmeletemplate_id IN (160, 215)                    UNION...
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Create Oracle users with correct permissions in wcs commerce

      Create Oracle users with correct permissions ·        Login to Oracle SQL developer as a master user ·        Run the following scripts to create a database user and DBA user. Make sure you change username according to the environment. If createInstance fails and you need to drop and recreate users, you don’t need to run the “create tablespace” command again.   # Install/Configure Oracle database # Configure the oracle database # Change the user and passwords according to the environment create tablespace WCTBLSPC datafile size 100M autoextend on next 2M maxsize unlimited; CREATE USER jbdev2user IDENTIFIED BY jbdev2user DEFAULT TABLESPACE "USERS" TEMPORARY TABLESPACE "TEMP"; CREATE USER jbdev2dba IDENTIFIED BY jbdev2dba DEFAULT TABLESPACE "USERS" TEMPORARY TABLESPACE "TEMP"; grant create procedure, create sequence, create session, create synonym, create table,cre...
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