Atlas 503 Service Unavailable without errors in log

[#1]

From Cloudera Manager it appears like Atlas Service is in good health, but it doesn't start at all. When I try to access the Web UI, it shows an Http Error 503 Service Unavailable but the application.log doesn't show any error; it just halts.

Here is the application.log whe I restart Atlas service from Cloudera Manager:

2022-01-31 12:04:28,657 INFO - [shutdown-hook-0:] ~ ==> Shutdown of Atlas (Atlas$1:63)
2022-01-31 12:04:28,668 INFO - [shutdown-hook-0:] ~ <== Shutdown of Atlas (Atlas$1:69)
2022-01-31 12:09:49,319 INFO - [main:] ~ Loading atlas-application.properties from file:/var/run/cloudera-scm-agent/process/6754-atlas-ATLAS_SERVER/conf/atlas-application.properties (ApplicationProperties:137)
2022-01-31 12:09:49,327 INFO - [main:] ~ Using graphdb backend 'janus' (ApplicationProperties:317)
2022-01-31 12:09:49,327 INFO - [main:] ~ Using storage backend 'hbase2' (ApplicationProperties:328)
2022-01-31 12:09:49,327 INFO - [main:] ~ Using index backend 'solr' (ApplicationProperties:339)
2022-01-31 12:09:49,328 INFO - [main:] ~ Atlas is running in MODE: PROD. (ApplicationProperties:343)
2022-01-31 12:09:49,328 INFO - [main:] ~ Setting solr-wait-searcher property 'true' (ApplicationProperties:349)
2022-01-31 12:09:49,329 INFO - [main:] ~ Setting index.search.map-name property 'false' (ApplicationProperties:353)
2022-01-31 12:09:49,329 INFO - [main:] ~ Using atlas.graph.index.search.max-result-set-size = 500000 (ApplicationProperties:363)
2022-01-31 12:09:49,329 INFO - [main:] ~ Property (set to default) atlas.graph.cache.db-cache = true (ApplicationProperties:375)
2022-01-31 12:09:49,329 INFO - [main:] ~ Property (set to default) atlas.graph.cache.db-cache-clean-wait = 20 (ApplicationProperties:375)
2022-01-31 12:09:49,329 INFO - [main:] ~ Property (set to default) atlas.graph.cache.db-cache-size = 0.5 (ApplicationProperties:375)
2022-01-31 12:09:49,329 INFO - [main:] ~ Property (set to default) atlas.graph.cache.tx-cache-size = 15000 (ApplicationProperties:375)
2022-01-31 12:09:49,329 INFO - [main:] ~ Property (set to default) atlas.graph.cache.tx-dirty-size = 120 (ApplicationProperties:375)
2022-01-31 12:09:49,335 INFO - [main:] ~
########################################################################################
Atlas Server (STARTUP)

project.name: apache-atlas
project.description: Metadata Management and Data Governance Platform over Hadoop
build.user: jenkins
build.epoch: 1615291035511
project.version: 2.1.0.7.1.6.0-297
build.version: 2.1.0.7.1.6.0-297
vc.revision: 0b549aa29de55ea44b7e05e11c689dfc424802b0
vc.source.url: scm:git:git://git.apache.org/atlas.git/atlas-webapp
######################################################################################## (Atlas:215)
2022-01-31 12:09:49,335 INFO - [main:] ~ >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> (Atlas:216)
2022-01-31 12:09:49,335 INFO - [main:] ~ Server starting with TLS ? true on port 31443 (Atlas:217)
2022-01-31 12:09:49,336 INFO - [main:] ~ <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< (Atlas:218)
2022-01-31 12:09:49,362 INFO - [main:] ~ Attempting to retrieve password for key keystore.password from cert.stores.credential.provider.path configured credential provider path localjceks://file//var/run/cloudera-scm-agent/process/6754-atlas-ATLAS_SERVER/conf/atlascreds.localjceks (SecurityUtil:63)
2022-01-31 12:09:49,630 INFO - [main:] ~ Attempting to retrieve password for key truststore.password from cert.stores.credential.provider.path configured credential provider path localjceks://file//var/run/cloudera-scm-agent/process/6754-atlas-ATLAS_SERVER/conf/atlascreds.localjceks (SecurityUtil:63)
2022-01-31 12:09:49,779 INFO - [main:] ~ Attempting to retrieve password for key keystore.password from cert.stores.credential.provider.path configured credential provider path localjceks://file//var/run/cloudera-scm-agent/process/6754-atlas-ATLAS_SERVER/conf/atlascreds.localjceks (SecurityUtil:63)
2022-01-31 12:09:49,871 INFO - [main:] ~ Attempting to retrieve password for key password from cert.stores.credential.provider.path configured credential provider path localjceks://file//var/run/cloudera-scm-agent/process/6754-atlas-ATLAS_SERVER/conf/atlascreds.localjceks (SecurityUtil:63)
2022-01-31 12:09:49,959 INFO - [main:] ~ Attempting to retrieve password for key truststore.password from cert.stores.credential.provider.path configured credential provider path localjceks://file//var/run/cloudera-scm-agent/process/6754-atlas-ATLAS_SERVER/conf/atlascreds.localjceks (SecurityUtil:63)

[#2]

Update:

I was able to find another log which actually presents an error; although I've still been unable to solve the issue. The error seems to be over the Jetty's WebApp Context.

Log file: /var/run/cloudera-scm-agent/process/6759-atlas-ATLAS_SERVER/logs/stderr.log

+ classpath='/opt/cloudera/parcels/CDH-7.1.6-1.cdh7.1.6.p0.10506313/lib/atlas/conf:/opt/cloudera/parcels/CDH-7.1.6-1.cdh7.1.6.p0.10506313/lib/atlas/server/webapp/atlas/WEB-INF/classes:/opt/cloudera/parcels/CDH-7.1.6-1.cdh7.1.6.p0.10506313/lib/atlas/server/webapp/atlas/WEB-INF/lib/*:/opt/cloudera/parcels/CDH-7.1.6-1.cdh7.1.6.p0.10506313/lib/atlas/libext/*:/var/run/cloudera-scm-agent/process/6758-atlas-ATLAS_SERVER/hbase-conf:/var/run/cloudera-scm-agent/process/6758-atlas-ATLAS_SERVER/conf'
+ ATLAS_START_COMMAND='/usr/java/jdk1.8.0_181-cloudera/bin/java -Dproc_atlasmetadata -Datlas.log.dir=/var/log/atlas -Datlas.log.file=application.log -Datlas.home=/opt/cloudera/parcels/CDH-7.1.6-1.cdh7.1.6.p0.10506313/lib/atlas -Datlas.conf=/var/run/cloudera-scm-agent/process/6758-atlas-ATLAS_SERVER/conf -Xms8192m -Xmx8192m -XX:MaxNewSize=614m -XX:MetaspaceSize=100M -XX:MaxMetaspaceSize=512m -server -XX:SoftRefLRUPolicyMSPerMB=0 -XX:+CMSClassUnloadingEnabled -XX:+UseConcMarkSweepGC -XX:+CMSParallelRemarkEnabled -XX:+PrintTenuringDistribution -XX:+HeapDumpOnOutOfMemoryError -XX:HeapDumpPath=dumps/atlas_server.hprof -Xloggc:/var/log/atlas/gc-worker.log -verbose:gc -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=10 -XX:GCLogFileSize=1m -XX:+PrintGCDetails -XX:+PrintHeapAtGC -XX:+PrintGCTimeStamps -Dsun.security.krb5.disableReferrals=true -Djdk.tls.ephemeralDHKeySize=2048 -Dlog4j.configuration=file:/var/run/cloudera-scm-agent/process/6758-atlas-ATLAS_SERVER/conf/atlas-log4j.properties -Djava.security.auth.login.config=/var/run/cloudera-scm-agent/process/6758-atlas-ATLAS_SERVER/conf/atlas_jaas.conf -XX:+HeapDumpOnOutOfMemoryError -XX:HeapDumpPath=/tmp/atlas_atlas-ATLAS_SERVER-350b5a9cc90886417b36cedb69cedd15_pid29622.hprof -XX:OnOutOfMemoryError=/opt/cloudera/cm-agent/service/common/killparent.sh -classpath /opt/cloudera/parcels/CDH-7.1.6-1.cdh7.1.6.p0.10506313/lib/atlas/conf:/opt/cloudera/parcels/CDH-7.1.6-1.cdh7.1.6.p0.10506313/lib/atlas/server/webapp/atlas/WEB-INF/classes:/opt/cloudera/parcels/CDH-7.1.6-1.cdh7.1.6.p0.10506313/lib/atlas/server/webapp/atlas/WEB-INF/lib/*:/opt/cloudera/parcels/CDH-7.1.6-1.cdh7.1.6.p0.10506313/lib/atlas/libext/*:/var/run/cloudera-scm-agent/process/6758-atlas-ATLAS_SERVER/hbase-conf:/var/run/cloudera-scm-agent/process/6758-atlas-ATLAS_SERVER/conf org.apache.atlas.Atlas -app /opt/cloudera/parcels/CDH-7.1.6-1.cdh7.1.6.p0.10506313/lib/atlas/server/webapp/atlas'
+ exec /usr/java/jdk1.8.0_181-cloudera/bin/java -Dproc_atlasmetadata -Datlas.log.dir=/var/log/atlas -Datlas.log.file=application.log -Datlas.home=/opt/cloudera/parcels/CDH-7.1.6-1.cdh7.1.6.p0.10506313/lib/atlas -Datlas.conf=/var/run/cloudera-scm-agent/process/6758-atlas-ATLAS_SERVER/conf -Xms8192m -Xmx8192m -XX:MaxNewSize=614m -XX:MetaspaceSize=100M -XX:MaxMetaspaceSize=512m -server -XX:SoftRefLRUPolicyMSPerMB=0 -XX:+CMSClassUnloadingEnabled -XX:+UseConcMarkSweepGC -XX:+CMSParallelRemarkEnabled -XX:+PrintTenuringDistribution -XX:+HeapDumpOnOutOfMemoryError -XX:HeapDumpPath=dumps/atlas_server.hprof -Xloggc:/var/log/atlas/gc-worker.log -verbose:gc -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=10 -XX:GCLogFileSize=1m -XX:+PrintGCDetails -XX:+PrintHeapAtGC -XX:+PrintGCTimeStamps -Dsun.security.krb5.disableReferrals=true -Djdk.tls.ephemeralDHKeySize=2048 -Dlog4j.configuration=file:/var/run/cloudera-scm-agent/process/6758-atlas-ATLAS_SERVER/conf/atlas-log4j.properties -Djava.security.auth.login.config=/var/run/cloudera-scm-agent/process/6758-atlas-ATLAS_SERVER/conf/atlas_jaas.conf -XX:+HeapDumpOnOutOfMemoryError -XX:HeapDumpPath=/tmp/atlas_atlas-ATLAS_SERVER-350b5a9cc90886417b36cedb69cedd15_pid29622.hprof -XX:OnOutOfMemoryError=/opt/cloudera/cm-agent/service/common/killparent.sh -classpath '/opt/cloudera/parcels/CDH-7.1.6-1.cdh7.1.6.p0.10506313/lib/atlas/conf:/opt/cloudera/parcels/CDH-7.1.6-1.cdh7.1.6.p0.10506313/lib/atlas/server/webapp/atlas/WEB-INF/classes:/opt/cloudera/parcels/CDH-7.1.6-1.cdh7.1.6.p0.10506313/lib/atlas/server/webapp/atlas/WEB-INF/lib/*:/opt/cloudera/parcels/CDH-7.1.6-1.cdh7.1.6.p0.10506313/lib/atlas/libext/*:/var/run/cloudera-scm-agent/process/6758-atlas-ATLAS_SERVER/hbase-conf:/var/run/cloudera-scm-agent/process/6758-atlas-ATLAS_SERVER/conf' org.apache.atlas.Atlas -app /opt/cloudera/parcels/CDH-7.1.6-1.cdh7.1.6.p0.10506313/lib/atlas/server/webapp/atlas
log4j:WARN No such property [maxFileSize] in org.apache.log4j.PatternLayout.
log4j:WARN No such property [maxBackupIndex] in org.apache.log4j.PatternLayout.
log4j:ERROR Could not find value for key log4j.appender.METRICS.layout
log4j:WARN No such property [maxFileSize] in org.apache.log4j.PatternLayout.
log4j:WARN No such property [maxBackupIndex] in org.apache.log4j.PatternLayout.
log4j:WARN No such property [maxFileSize] in org.apache.log4j.PatternLayout.
log4j:WARN No such property [maxBackupIndex] in org.apache.log4j.PatternLayout.
log4j:ERROR Could not find value for key log4j.appender.LARGE_MESSAGE
log4j:ERROR Could not instantiate appender named "LARGE_MESSAGE".
2022-02-01 10:20:53,954 WARN - [main:] ~ Failed startup of context o.e.j.w.WebAppContext@50313382{/,file:///opt/cloudera/parcels/CDH-7.1.6-1.cdh7.1.6.p0.10506313/lib/atlas/server/webapp/atlas/,UNAVAILABLE}{/opt/cloudera/parcels/CDH-7.1.6-1.cdh7.1.6.p0.10506313/lib/atlas/server/webapp/atlas} (WebAppContext:533)
java.net.ConnectException: Connection timed out (Connection timed out)
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
at java.net.Socket.connect(Socket.java:589)
at java.net.Socket.connect(Socket.java:538)
at sun.net.NetworkClient.doConnect(NetworkClient.java:180)
at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
at sun.net.www.http.HttpClient.New(HttpClient.java:339)
at sun.net.www.http.HttpClient.New(HttpClient.java:357)
at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1564)
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1492)
at com.sun.org.apache.xerces.internal.impl.XMLEntityManager.setupCurrentEntity(XMLEntityManager.java:647)
at com.sun.org.apache.xerces.internal.impl.XMLEntityManager.startEntity(XMLEntityManager.java:1304)
at com.sun.org.apache.xerces.internal.impl.XMLEntityManager.startDTDEntity(XMLEntityManager.java:1270)
at com.sun.org.apache.xerces.internal.impl.XMLDTDScannerImpl.setInputSource(XMLDTDScannerImpl.java:264)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$DTDDriver.dispatch(XMLDocumentScannerImpl.java:1161)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$DTDDriver.next(XMLDocumentScannerImpl.java:1045)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$PrologDriver.next(XMLDocumentScannerImpl.java:959)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(XMLDocumentScannerImpl.java:602)
at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.next(XMLNSDocumentScannerImpl.java:112)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:505)
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:842)
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:771)
at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:141)
at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1213)
at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(SAXParserImpl.java:643)
at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl.parse(SAXParserImpl.java:327)
at org.eclipse.jetty.xml.XmlParser.parse(XmlParser.java:244)
at org.eclipse.jetty.webapp.Descriptor.parse(Descriptor.java:53)
at org.eclipse.jetty.webapp.WebDescriptor.parse(WebDescriptor.java:213)
at org.eclipse.jetty.webapp.MetaData.setWebXml(MetaData.java:193)
at org.eclipse.jetty.webapp.WebXmlConfiguration.preConfigure(WebXmlConfiguration.java:55)
at org.eclipse.jetty.webapp.WebAppContext.preConfigure(WebAppContext.java:488)
at org.eclipse.jetty.webapp.WebAppContext.doStart(WebAppContext.java:523)
at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:72)
at org.eclipse.jetty.util.component.ContainerLifeCycle.start(ContainerLifeCycle.java:169)
at org.eclipse.jetty.server.Server.start(Server.java:408)
at org.eclipse.jetty.util.component.ContainerLifeCycle.doStart(ContainerLifeCycle.java:110)
at org.eclipse.jetty.server.handler.AbstractHandler.doStart(AbstractHandler.java:97)
at org.eclipse.jetty.server.Server.doStart(Server.java:372)
at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:72)
at org.apache.atlas.web.service.EmbeddedServer.start(EmbeddedServer.java:113)
at org.apache.atlas.Atlas.main(Atlas.java:133)
2022-02-01 10:20:53,981 WARN - [main:] ~ Weak cipher suite TLS_RSA_WITH_AES_256_CBC_SHA256 enabled for Server@7fc4780b[provider=null,keyStore=file:///run/cloudera-scm-agent/process/6758-atlas-ATLAS_SERVER/cm-auto-host_keystore.jks,trustStore=file:///var/lib/cloudera-scm-agent/agent-cert/cm-auto-global_truststore.jks] (SslContextFactory:291)
2022-02-01 10:20:53,981 WARN - [main:] ~ Weak cipher suite TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA enabled for Server@7fc4780b[provider=null,keyStore=file:///run/cloudera-scm-agent/process/6758-atlas-ATLAS_SERVER/cm-auto-host_keystore.jks,trustStore=file:///var/lib/cloudera-scm-agent/agent-cert/cm-auto-global_truststore.jks] (SslContextFactory:291)
2022-02-01 10:20:53,981 WARN - [main:] ~ Weak cipher suite TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA enabled for Server@7fc4780b[provider=null,keyStore=file:///run/cloudera-scm-agent/process/6758-atlas-ATLAS_SERVER/cm-auto-host_keystore.jks,trustStore=file:///var/lib/cloudera-scm-agent/agent-cert/cm-auto-global_truststore.jks] (SslContextFactory:291)
2022-02-01 10:20:53,981 WARN - [main:] ~ Weak cipher suite TLS_RSA_WITH_AES_256_CBC_SHA enabled for Server@7fc4780b[provider=null,keyStore=file:///run/cloudera-scm-agent/process/6758-atlas-ATLAS_SERVER/cm-auto-host_keystore.jks,trustStore=file:///var/lib/cloudera-scm-agent/agent-cert/cm-auto-global_truststore.jks] (SslContextFactory:291)
2022-02-01 10:20:53,982 WARN - [main:] ~ Weak cipher suite TLS_RSA_WITH_AES_256_CBC_SHA enabled for Server@7fc4780b[provider=null,keyStore=file:///run/cloudera-scm-agent/process/6758-atlas-ATLAS_SERVER/cm-auto-host_keystore.jks,trustStore=file:///var/lib/cloudera-scm-agent/agent-cert/cm-auto-global_truststore.jks] (SslContextFactory:291)
2022-02-01 10:20:53,982 WARN - [main:] ~ Weak cipher suite TLS_ECDH_ECDSA_WITH_AES_256_CBC_SHA enabled for Server@7fc4780b[provider=null,keyStore=file:///run/cloudera-scm-agent/process/6758-atlas-ATLAS_SERVER/cm-auto-host_keystore.jks,trustStore=file:///var/lib/cloudera-scm-agent/agent-cert/cm-auto-global_truststore.jks] (SslContextFactory:291)
2022-02-01 10:20:53,982 WARN - [main:] ~ Weak cipher suite TLS_ECDH_RSA_WITH_AES_256_CBC_SHA enabled for Server@7fc4780b[provider=null,keyStore=file:///run/cloudera-scm-agent/process/6758-atlas-ATLAS_SERVER/cm-auto-host_keystore.jks,trustStore=file:///var/lib/cloudera-scm-agent/agent-cert/cm-auto-global_truststore.jks] (SslContextFactory:291)
2022-02-01 10:20:53,982 WARN - [main:] ~ Weak cipher suite TLS_DHE_RSA_WITH_AES_256_CBC_SHA enabled for Server@7fc4780b[provider=null,keyStore=file:///run/cloudera-scm-agent/process/6758-atlas-ATLAS_SERVER/cm-auto-host_keystore.jks,trustStore=file:///var/lib/cloudera-scm-agent/agent-cert/cm-auto-global_truststore.jks] (SslContextFactory:291)
2022-02-01 10:20:53,982 WARN - [main:] ~ Weak cipher suite TLS_RSA_WITH_AES_128_CBC_SHA256 enabled for Server@7fc4780b[provider=null,keyStore=file:///run/cloudera-scm-agent/process/6758-atlas-ATLAS_SERVER/cm-auto-host_keystore.jks,trustStore=file:///var/lib/cloudera-scm-agent/agent-cert/cm-auto-global_truststore.jks] (SslContextFactory:291)
2022-02-01 10:20:53,983 WARN - [main:] ~ Weak cipher suite TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA enabled for Server@7fc4780b[provider=null,keyStore=file:///run/cloudera-scm-agent/process/6758-atlas-ATLAS_SERVER/cm-auto-host_keystore.jks,trustStore=file:///var/lib/cloudera-scm-agent/agent-cert/cm-auto-global_truststore.jks] (SslContextFactory:291)
2022-02-01 10:20:53,983 WARN - [main:] ~ Weak cipher suite TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA enabled for Server@7fc4780b[provider=null,keyStore=file:///run/cloudera-scm-agent/process/6758-atlas-ATLAS_SERVER/cm-auto-host_keystore.jks,trustStore=file:///var/lib/cloudera-scm-agent/agent-cert/cm-auto-global_truststore.jks] (SslContextFactory:291)
2022-02-01 10:20:53,983 WARN - [main:] ~ Weak cipher suite TLS_RSA_WITH_AES_128_CBC_SHA enabled for Server@7fc4780b[provider=null,keyStore=file:///run/cloudera-scm-agent/process/6758-atlas-ATLAS_SERVER/cm-auto-host_keystore.jks,trustStore=file:///var/lib/cloudera-scm-agent/agent-cert/cm-auto-global_truststore.jks] (SslContextFactory:291)
2022-02-01 10:20:53,983 WARN - [main:] ~ Weak cipher suite TLS_RSA_WITH_AES_128_CBC_SHA enabled for Server@7fc4780b[provider=null,keyStore=file:///run/cloudera-scm-agent/process/6758-atlas-ATLAS_SERVER/cm-auto-host_keystore.jks,trustStore=file:///var/lib/cloudera-scm-agent/agent-cert/cm-auto-global_truststore.jks] (SslContextFactory:291)
2022-02-01 10:20:53,983 WARN - [main:] ~ Weak cipher suite TLS_ECDH_ECDSA_WITH_AES_128_CBC_SHA enabled for Server@7fc4780b[provider=null,keyStore=file:///run/cloudera-scm-agent/process/6758-atlas-ATLAS_SERVER/cm-auto-host_keystore.jks,trustStore=file:///var/lib/cloudera-scm-agent/agent-cert/cm-auto-global_truststore.jks] (SslContextFactory:291)
2022-02-01 10:20:53,984 WARN - [main:] ~ Weak cipher suite TLS_ECDH_RSA_WITH_AES_128_CBC_SHA enabled for Server@7fc4780b[provider=null,keyStore=file:///run/cloudera-scm-agent/process/6758-atlas-ATLAS_SERVER/cm-auto-host_keystore.jks,trustStore=file:///var/lib/cloudera-scm-agent/agent-cert/cm-auto-global_truststore.jks] (SslContextFactory:291)
2022-02-01 10:20:53,984 WARN - [main:] ~ Weak cipher suite TLS_DHE_RSA_WITH_AES_128_CBC_SHA enabled for Server@7fc4780b[provider=null,keyStore=file:///run/cloudera-scm-agent/process/6758-atlas-ATLAS_SERVER/cm-auto-host_keystore.jks,trustStore=file:///var/lib/cloudera-scm-agent/agent-cert/cm-auto-global_truststore.jks] (SslContextFactory:291)
2022-02-01 10:20:53,985 WARN - [main:] ~ Weak cipher suite TLS_RSA_WITH_AES_256_GCM_SHA384 enabled for Server@7fc4780b[provider=null,keyStore=file:///run/cloudera-scm-agent/process/6758-atlas-ATLAS_SERVER/cm-auto-host_keystore.jks,trustStore=file:///var/lib/cloudera-scm-agent/agent-cert/cm-auto-global_truststore.jks] (SslContextFactory:291)
2022-02-01 10:20:53,985 WARN - [main:] ~ Weak cipher suite TLS_RSA_WITH_AES_128_GCM_SHA256 enabled for Server@7fc4780b[provider=null,keyStore=file:///run/cloudera-scm-agent/process/6758-atlas-ATLAS_SERVER/cm-auto-host_keystore.jks,trustStore=file:///var/lib/cloudera-scm-agent/agent-cert/cm-auto-global_truststore.jks] (SslContextFactory:291)
Exception in thread "main" org.apache.atlas.exception.AtlasBaseException: EmbeddedServer.Start: failed!
at org.apache.atlas.web.service.EmbeddedServer.start(EmbeddedServer.java:119)
at org.apache.atlas.Atlas.main(Atlas.java:133)
Caused by: java.lang.NullPointerException
at org.apache.atlas.BeanUtil.getBean(BeanUtil.java:36)
at org.apache.atlas.web.service.EmbeddedServer.auditServerStatus(EmbeddedServer.java:132)
at org.apache.atlas.web.service.EmbeddedServer.start(EmbeddedServer.java:115)
... 1 more

[#3 · Accepted solution]

Please try the below given solution 
i) SSH into the Atlas metadata server node

ii) Take a backup of the below web.xml file,

# cd /opt/cloudera/parcels/CDH-<%version%>/lib/atlas/server/webapp/atlas/WEB-INF
# cp web.xml web.xml.orig
 
iiI) Edit web.xml and remove the below lines to remove the DOCTYPE tag.

-------
<!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
        "http://java.sun.com/dtd/web-app_2_3.dtd">
-------

iv) Restart Atlas from the CM UI
===
After the above, please revert back if you're not able to access the Atlas Web UI successfully.

 It is listed under known issues in CDP 7.1.6 and CDP 7.1.7

Please refer following links for more details:
===
CDPD-22799: Apache Atlas displays 503 service unavailable on transparent proxy setup.
https://docs.cloudera.com/cdp-private-cloud-base/7.1.6/runtime-release-notes/topics/rt-pvc-known-iss...
https://docs.cloudera.com/cdp-private-cloud-base/7.1.7/runtime-release-notes/topics/rt-pvc-known-iss...
===

[#4]

Thank you shehbazk! This solved the issue