Add centos (#350)

* Add centos
* Address comments

dockerfiles/centos/is/Dockerfile

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+# ------------------------------------------------------------------------
+#
+# Copyright 2022 WSO2, LLC. (http://wso2.com)
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License
+#
+# ------------------------------------------------------------------------
+
+# set base Docker image to CentOS Docker image
+FROM centos:7
+LABEL maintainer="WSO2 Docker Maintainers <[email protected]>" \
+      com.wso2.docker.source="https://github.com/wso2/docker-is/releases/tag/v6.0.0.1"
+
+ENV LANG='en_US.UTF-8' LANGUAGE='en_US:en' LC_ALL='en_US.UTF-8'
+
+# Install JDK Dependencies
+RUN yum install -y tzdata openssl curl ca-certificates fontconfig gzip tar \
+    && yum clean all
+
+ENV JAVA_VERSION jdk-11.0.13+8
+
+# Install JDK11
+RUN set -eux; \
+    ARCH="$(objdump="$(command -v objdump)" && objdump --file-headers "$objdump" | awk -F '[:,]+[[:space:]]+' '$1 == "architecture" { print $2 }')"; \
+    case "${ARCH}" in \
+        amd64|i386:x86-64) \
+            ESUM='3b1c0c34be4c894e64135a454f2d5aaa4bd10aea04ec2fa0c0efe6bb26528e30'; \
+            BINARY_URL='https://github.com/adoptium/temurin11-binaries/releases/download/jdk-11.0.13%2B8/OpenJDK11U-jdk_x64_linux_hotspot_11.0.13_8.tar.gz'; \
+            ;; \
+        *) \
+            echo "Unsupported arch: ${ARCH}"; \
+            exit 1; \
+            ;; \
+    esac; \
+    curl -LfsSo /tmp/openjdk.tar.gz ${BINARY_URL}; \
+    echo "${ESUM} */tmp/openjdk.tar.gz" | sha256sum -c -; \
+    mkdir -p /opt/java/openjdk; \
+    cd /opt/java/openjdk; \
+    tar -xf /tmp/openjdk.tar.gz --strip-components=1; \
+    rm -rf /tmp/openjdk.tar.gz;
+
+ENV JAVA_HOME=/opt/java/openjdk \
+    PATH="/opt/java/openjdk/bin:$PATH"
+
+# set Docker image build arguments
+# build arguments for user/group configurations
+ARG USER=wso2carbon
+ARG USER_ID=802
+ARG USER_GROUP=wso2
+ARG USER_GROUP_ID=802
+ARG USER_HOME=/home/${USER}
+# build arguments for WSO2 product installation
+ARG WSO2_SERVER_NAME=wso2is
+ARG WSO2_SERVER_VERSION=6.0.0
+ARG WSO2_SERVER_REPOSITORY=product-is
+ARG WSO2_SERVER=${WSO2_SERVER_NAME}-${WSO2_SERVER_VERSION}
+ARG WSO2_SERVER_HOME=${USER_HOME}/${WSO2_SERVER}
+# build arguments for external artifacts
+ARG DNS_JAVA_VERSION=2.1.8
+ARG K8S_MEMBERSHIP_SCHEME_VERSION=1.0.9
+ARG MYSQL_CONNECTOR_VERSION=8.0.29
+# build argument for MOTD
+ARG MOTD='printf "\n\
+Welcome to WSO2 Docker resources.\n\
+------------------------------------ \n\
+This Docker container comprises of a WSO2 product, running with its latest GA release \n\
+which is under the Apache License, Version 2.0. \n\
+Read more about Apache License, Version 2.0 here @ http://www.apache.org/licenses/LICENSE-2.0.\n"'
+
+# create the non-root user and group and set MOTD login message
+RUN \
+    groupadd --system -g ${USER_GROUP_ID} ${USER_GROUP} \
+    && useradd --system --create-home --home-dir ${USER_HOME} --no-log-init -g ${USER_GROUP_ID} -u ${USER_ID} ${USER} \
+    && echo ${MOTD} > /etc/profile.d/motd.sh
+# create Java prefs dir
+# this is to avoid warning logs printed by FileSystemPreferences class
+RUN \
+    mkdir -p ${USER_HOME}/.java/.systemPrefs \
+    && mkdir -p ${USER_HOME}/.java/.userPrefs \
+    && chmod -R 755 ${USER_HOME}/.java \
+    && chown -R ${USER}:${USER_GROUP} ${USER_HOME}/.java
+
+# copy init script to user home
+COPY --chown=wso2carbon:wso2 docker-entrypoint.sh ${USER_HOME}/
+
+# install required packages
+RUN \
+    yum -y update \
+    && yum install -y \
+        nc \
+        unzip \
+        wget \
+    && rm -rf /var/cache/yum/*
+
+## set the user and work directory
+USER ${USER_ID}
+WORKDIR ${USER_HOME}
+
+COPY --chown=wso2carbon:wso2 ${WSO2_SERVER}.zip ${USER_HOME}/
+
+RUN \
+    unzip -d ${USER_HOME} ${WSO2_SERVER}.zip \
+    && chown wso2carbon:wso2 -R ${WSO2_SERVER_HOME} \
+    && rm -f ${WSO2_SERVER}.zip
+
+# add libraries for Kubernetes membership scheme based clustering
+ADD --chown=wso2carbon:wso2 https://repo1.maven.org/maven2/dnsjava/dnsjava/${DNS_JAVA_VERSION}/dnsjava-${DNS_JAVA_VERSION}.jar ${WSO2_SERVER_HOME}/repository/components/lib
+ADD --chown=wso2carbon:wso2 http://maven.wso2.org/nexus/content/repositories/releases/org/wso2/carbon/kubernetes/artifacts/kubernetes-membership-scheme/${K8S_MEMBERSHIP_SCHEME_VERSION}/kubernetes-membership-scheme-${K8S_MEMBERSHIP_SCHEME_VERSION}.jar ${WSO2_SERVER_HOME}/repository/components/dropins
+# add MySQL JDBC connector to server home as a third party library
+ADD --chown=wso2carbon:wso2 https://repo1.maven.org/maven2/mysql/mysql-connector-java/${MYSQL_CONNECTOR_VERSION}/mysql-connector-java-${MYSQL_CONNECTOR_VERSION}.jar ${WSO2_SERVER_HOME}/repository/components/dropins/
+
+
+# set environment variables
+ENV WORKING_DIRECTORY=${USER_HOME} \
+    WSO2_SERVER_HOME=${WSO2_SERVER_HOME}
+
+# expose ports
+EXPOSE 4000 9763 9443
+
+# initiate container and start WSO2 Carbon server
+ENTRYPOINT ["/home/wso2carbon/docker-entrypoint.sh"]

dockerfiles/centos/is/README.md

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+# Dockerfile for WSO2 Identity Server #
+
+This section defines the step-by-step instructions to build an [CentOS](https://hub.docker.com/_/centos/) Linux based Docker image for WSO2 Identity Server `5.11.0`.
+
+## Prerequisites
+
+* [Docker](https://www.docker.com/get-docker) `v17.09.0` or above
+* [Git](https://git-scm.com/book/en/v2/Getting-Started-Installing-Git) client
+
+## How to build an image and run
+
+##### 1. Checkout this repository into your local machine using the following Git client command.
+
+```
+git clone https://github.com/wso2/docker-is.git
+```
+
+>The local copy of the `dockerfiles/centos/is` directory will be referred to as `IS_DOCKERFILE_HOME` from this point onwards.
+
+##### 2. Copy the `wso2is-6.0.0.zip` to the `docker-is/dockerfiles/centos/is` directory
+
+##### 3.  Build the Docker image.
+- Navigate to `<IS_DOCKERFILE_HOME>` directory. <br>
+  Execute `docker build` command as shown below.
+    + `docker build -t wso2is:6.0.0-centos .`
+
+> By default, the Docker image will prepackage the General Availability (GA) release version of the relevant WSO2 product.
+
+> Tip - If you require the container to run with a different UID and GID, pass the preferred values of the UID and GID
+> as values for build arguments `USER_ID` and `USER_GROUP_ID` when building the image, as shown below. Note
+> that setting lower values for the UID and GID is not recommended.
++ `docker build -t wso2is:5.11.0-centos --build-arg USER_ID=<UID> --build-arg USER_GROUP_ID=<GID> .`
+
+##### 4. Running the Docker image.
+
+- `docker run -it -p 9443:9443 wso2is:6.0.0-centos`
+
+>Here, only port 9443 (HTTPS servlet transport) has been mapped to a Docker host port.
+You may map other container service ports, which have been exposed to Docker host ports, as desired.
+
+##### 5. Accessing management consoles.
+
+- To access the user interfaces, use the docker host IP and port 9443.
+    + Management Console: `https://<DOCKER_HOST>:9443/console`
+    + User Portal: `https://<DOCKER_HOST>:9443/myaccount`
+
+>In here, <DOCKER_HOST> refers to hostname or IP of the host machine on top of which containers are spawned.
+
+## How to update configurations
+
+Configurations would lie on the Docker host machine and they can be volume mounted to the container. <br>
+As an example, steps required to change the port offset using `deployment.toml` is as follows:
+
+##### 1. Stop the Identity Server container if it's already running.
+
+In WSO2 Identity Server version `6.0.0` product distribution, `deployment.toml` configuration file <br>
+can be found at `<DISTRIBUTION_HOME>/repository/conf`. Copy the file to some suitable location of the host machine, <br>
+referred to as `<SOURCE_CONFIGS>/deployment.toml` and change the `[server] -> offset` value to 1.
+
+##### 2. Grant read permission to `other` users for `<SOURCE_CONFIGS>/deployment.toml`.
+
+```
+chmod o+r <SOURCE_CONFIGS>/deployment.toml
+```
+
+##### 3. Run the image by mounting the file to container as follows:
+
+```
+docker run \
+-p 9444:9444 \
+--volume <SOURCE_CONFIGS>/deployment.toml:<TARGET_CONFIGS>/deployment.toml \
+wso2is:6.0.0-centos
+```
+
+>In here, <TARGET_CONFIGS> refers to /home/wso2carbon/wso2is-6.0.0/repository/conf folder of the container.
+
+## Docker command usage references
+
+* [Docker build command reference](https://docs.docker.com/engine/reference/commandline/build/)
+* [Docker run command reference](https://docs.docker.com/engine/reference/run/)
+* [Dockerfile reference](https://docs.docker.com/engine/reference/builder/)

dockerfiles/centos/is/docker-entrypoint.sh

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+#!/bin/sh
+# ------------------------------------------------------------------------
+# Copyright 2022 WSO2, LLC. (http://wso2.com)
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License
+# ------------------------------------------------------------------------
+
+set -e
+
+# volume mounts
+config_volume=${WORKING_DIRECTORY}/wso2-config-volume
+artifact_volume=${WORKING_DIRECTORY}/wso2-artifact-volume
+
+# check if the WSO2 non-root user home exists
+test ! -d ${WORKING_DIRECTORY} && echo "WSO2 Docker non-root user home does not exist" && exit 1
+
+# check if the WSO2 product home exists
+test ! -d ${WSO2_SERVER_HOME} && echo "WSO2 Docker product home does not exist" && exit 1
+
+# copy any configuration changes mounted to config_volume
+test -d ${config_volume} && [ "$(ls -A ${config_volume})" ] && cp -RL ${config_volume}/* ${WSO2_SERVER_HOME}/
+# copy any artifact changes mounted to artifact_volume
+test -d ${artifact_volume} && [ "$(ls -A ${artifact_volume})" ] && cp -RL ${artifact_volume}/* ${WSO2_SERVER_HOME}/
+
+# start WSO2 Carbon server
+sh ${WSO2_SERVER_HOME}/bin/wso2server.sh "$@"