HDDS-1972. Provide example ha proxy with multiple s3 servers back end.

hadoop-ozone/dist/src/main/compose/ozones3-haproxy/.env

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+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you 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.
+
+HDDS_VERSION=${hdds.version}
+HADOOP_RUNNER_VERSION=${docker.ozone-runner.version}

hadoop-ozone/dist/src/main/compose/ozones3-haproxy/docker-compose.yaml

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+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you 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.
+
+version: "3"
+services:
+   s3g:
+      image: haproxy:latest
+      volumes:
+         - ../..:/opt/hadoop
+         - ./haproxy-conf/haproxy.cfg:/usr/local/etc/haproxy/haproxy.cfg
+      ports:
+         - 9878:9878
+   datanode:
+      image: apache/ozone-runner:${HADOOP_RUNNER_VERSION}
+      volumes:
+        - ../..:/opt/hadoop
+      ports:
+        - 9864
+      command: ["ozone","datanode"]
+      env_file:
+        - ./docker-config
+   om:
+      image: apache/ozone-runner:${HADOOP_RUNNER_VERSION}
+      volumes:
+         - ../..:/opt/hadoop
+      ports:
+         - 9874:9874
+      environment:
+         ENSURE_OM_INITIALIZED: /data/metadata/om/current/VERSION
+      env_file:
+          - ./docker-config
+      command: ["ozone","om"]
+   scm:
+      image: apache/ozone-runner:${HADOOP_RUNNER_VERSION}
+      volumes:
+         - ../..:/opt/hadoop
+      ports:
+         - 9876:9876
+      env_file:
+          - ./docker-config
+      environment:
+          ENSURE_SCM_INITIALIZED: /data/metadata/scm/current/VERSION
+      command: ["ozone","scm"]
+   s3g1:
+      image: apache/ozone-runner:${HADOOP_RUNNER_VERSION}
+      volumes:
+         - ../..:/opt/hadoop
+      ports:
+         - 9879:9878
+      env_file:
+          - ./docker-config
+      command: ["ozone","s3g"]
+   s3g2:
+      image: apache/ozone-runner:${HADOOP_RUNNER_VERSION}
+      volumes:
+         - ../..:/opt/hadoop
+      ports:
+         - 9880:9878
+      env_file:
+         - ./docker-config
+      command: ["ozone","s3g"]
+   s3g3:
+      image: apache/ozone-runner:${HADOOP_RUNNER_VERSION}
+      volumes:
+         - ../..:/opt/hadoop
+      ports:
+         - 9881:9878
+      env_file:
+         - ./docker-config
+      command: ["ozone","s3g"]

hadoop-ozone/dist/src/main/compose/ozones3-haproxy/docker-config

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+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you 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.
+
+OZONE-SITE.XML_ozone.om.address=om
+OZONE-SITE.XML_ozone.scm.names=scm
+OZONE-SITE.XML_ozone.enabled=true
+OZONE-SITE.XML_ozone.scm.datanode.id.dir=/data
+OZONE-SITE.XML_ozone.scm.block.client.address=scm
+OZONE-SITE.XML_ozone.metadata.dirs=/data/metadata
+OZONE-SITE.XML_ozone.scm.client.address=scm
+OZONE-SITE.XML_ozone.replication=1
+OZONE-SITE.XML_hdds.datanode.dir=/data/hdds
+
+HDFS-SITE.XML_rpc.metrics.quantile.enable=true
+HDFS-SITE.XML_rpc.metrics.percentiles.intervals=60,300
+LOG4J.PROPERTIES_log4j.rootLogger=INFO, stdout
+LOG4J.PROPERTIES_log4j.appender.stdout=org.apache.log4j.ConsoleAppender
+LOG4J.PROPERTIES_log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
+LOG4J.PROPERTIES_log4j.appender.stdout.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss} %-5p %c{1}:%L - %m%n
+LOG4J.PROPERTIES_log4j.logger.org.apache.hadoop.util.NativeCodeLoader=ERROR
+LOG4J.PROPERTIES_log4j.logger.org.apache.ratis.conf.ConfUtils=WARN
+LOG4J.PROPERTIES_log4j.logger.org.apache.hadoop.security.ShellBasedUnixGroupsMapping=ERROR
+LOG4J.PROPERTIES_log4j.logger.http.requests.s3gateway=INFO,s3gatewayrequestlog
+LOG4J.PROPERTIES_log4j.appender.s3gatewayrequestlog=org.apache.hadoop.http.HttpRequestLogAppender
+LOG4J.PROPERTIES_log4j.appender.s3gatewayrequestlog.Filename=/tmp/jetty-s3gateway-yyyy_mm_dd.log
+LOG4J.PROPERTIES_log4j.appender.s3gatewayrequestlog.RetainDays=3
+
+#Enable this variable to print out all hadoop rpc traffic to the stdout. See http://byteman.jboss.org/ to define your own instrumentation.
+#BYTEMAN_SCRIPT_URL=https://raw.githubusercontent.com/apache/hadoop/trunk/dev-support/byteman/hadooprpc.btm
+
+#LOG4J2.PROPERTIES_* are for Ozone Audit Logging
+LOG4J2.PROPERTIES_monitorInterval=30
+LOG4J2.PROPERTIES_filter=read,write
+LOG4J2.PROPERTIES_filter.read.type=MarkerFilter
+LOG4J2.PROPERTIES_filter.read.marker=READ
+LOG4J2.PROPERTIES_filter.read.onMatch=DENY
+LOG4J2.PROPERTIES_filter.read.onMismatch=NEUTRAL
+LOG4J2.PROPERTIES_filter.write.type=MarkerFilter
+LOG4J2.PROPERTIES_filter.write.marker=WRITE
+LOG4J2.PROPERTIES_filter.write.onMatch=NEUTRAL
+LOG4J2.PROPERTIES_filter.write.onMismatch=NEUTRAL
+LOG4J2.PROPERTIES_appenders=console, rolling
+LOG4J2.PROPERTIES_appender.console.type=Console
+LOG4J2.PROPERTIES_appender.console.name=STDOUT
+LOG4J2.PROPERTIES_appender.console.layout.type=PatternLayout
+LOG4J2.PROPERTIES_appender.console.layout.pattern=%d{DEFAULT} | %-5level | %c{1} | %msg | %throwable{3} %n
+LOG4J2.PROPERTIES_appender.rolling.type=RollingFile
+LOG4J2.PROPERTIES_appender.rolling.name=RollingFile
+LOG4J2.PROPERTIES_appender.rolling.fileName=${sys:hadoop.log.dir}/om-audit-${hostName}.log
+LOG4J2.PROPERTIES_appender.rolling.filePattern=${sys:hadoop.log.dir}/om-audit-${hostName}-%d{yyyy-MM-dd-HH-mm-ss}-%i.log.gz
+LOG4J2.PROPERTIES_appender.rolling.layout.type=PatternLayout
+LOG4J2.PROPERTIES_appender.rolling.layout.pattern=%d{DEFAULT} | %-5level | %c{1} | %msg | %throwable{3} %n
+LOG4J2.PROPERTIES_appender.rolling.policies.type=Policies
+LOG4J2.PROPERTIES_appender.rolling.policies.time.type=TimeBasedTriggeringPolicy
+LOG4J2.PROPERTIES_appender.rolling.policies.time.interval=86400
+LOG4J2.PROPERTIES_appender.rolling.policies.size.type=SizeBasedTriggeringPolicy
+LOG4J2.PROPERTIES_appender.rolling.policies.size.size=64MB
+LOG4J2.PROPERTIES_loggers=audit
+LOG4J2.PROPERTIES_logger.audit.type=AsyncLogger
+LOG4J2.PROPERTIES_logger.audit.name=OMAudit
+LOG4J2.PROPERTIES_logger.audit.level=INFO
+LOG4J2.PROPERTIES_logger.audit.appenderRefs=rolling
+LOG4J2.PROPERTIES_logger.audit.appenderRef.file.ref=RollingFile
+LOG4J2.PROPERTIES_rootLogger.level=INFO
+LOG4J2.PROPERTIES_rootLogger.appenderRefs=stdout
+LOG4J2.PROPERTIES_rootLogger.appenderRef.stdout.ref=STDOUT

hadoop-ozone/dist/src/main/compose/ozones3-haproxy/haproxy-conf/haproxy.cfg

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+# Simple configuration for an HTTP proxy listening on port 9878 on all
+# interfaces and forwarding requests to a multiple multiple S3 servers in round
+# robin fashion.
+global
+    daemon
+    maxconn 256
+
+defaults
+    mode http
+    timeout connect 5000ms
+    timeout client 50000ms
+    timeout server 50000ms
+
+frontend http-in
+    bind *:9878
+    default_backend servers
+
+backend servers
+    balance roundrobin
+    server server1 s3g1:9878 maxconn 32
+    server server2 s3g2:9878 maxconn 32
+    server server3 s3g3:9878 maxconn 32

hadoop-ozone/dist/src/main/compose/ozones3-haproxy/test.sh

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+#!/usr/bin/env bash
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you 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.
+
+COMPOSE_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null 2>&1 && pwd )"
+export COMPOSE_DIR
+
+# shellcheck source=/dev/null
+source "$COMPOSE_DIR/../testlib.sh"
+
+start_docker_env
+
+execute_robot_test scm basic/basic.robot
+
+stop_docker_env
+
+generate_report