Before enabling kerberos, the HDFS user is the only one that can list out files owned by itself: [root@cm-r01en01 run]# hdfs dfs -ls /tmp/.cloudera_health_monitoring_canary_files/.canary_file_2019_08_20-19_28_02.abab681cca56293als: Permission denied: user=root, access=EXECUTE, inode="/tmp/.cloudera_health_monitoring_canary_files":hdfs:supergroup:d——— You'll need to run the command via SUDO like this: [root@cm-r01en01 run]# sudo su -c "hdfs dfs -ls /tmp/.cloudera_health_monitoring_canary_files/.canary_file_2019_08_20-19_28_02.abab681cca56293a" -s /bin/bash hdfs -rw-rw-rw-   3 hdfs […]

Seeing slow SSD performance through SATA 3.0?  Tired of transfer rates of 30MB/s when you should be seeing at least 150MB/s?  Fix this by adding the following kernel parameters: libata.noacpi=1 Cheers, TK

Getting this? FATAL: Module scsi_wait_scan not found. This is likely followed by a kernel panic.  Look for a non existing mount point being defined, such as a LVM_swap partition that doesn't exist. Remove it.  Also remove any non existent partitions in /etc/fstab through the recovery console. Cheers, TK

Getting this? SLF4J: Actual binding is of type [org.apache.logging.slf4j.Log4jLoggerFactory] ERROR StatusLogger No log4j2 configuration file found. Using default configuration: logging only errors to the console. Set system property 'org.apache.logging.log4j.simplelog.StatusLogger.level' to TRACE to show Log4j2 internal initialization logging. Investigate by first running the command manually: [oozie@cm-r01en01 ~]$ /usr/java/latest/bin/java -Xms52428800 -Xmx52428800 -XX:+UseG1GC -XX:MaxGCPauseMillis=20 -XX:InitiatingHeapOccupancyPercent=35 -XX:G1HeapRegionSize=16M -XX:MinMetaspaceFreeRatio=50 -XX:MaxMetaspaceFreeRatio=80 […]

Running into this? java.lang.ClassNotFoundException: org.cloudera.log4j.redactor.RedactorAppender Solve it with this: [root@awx01 ansible]# ansible 'cm*' -m shell -a 'cd /opt/cloudera/parcels/CDH/lib/oozie/libtools; ln -s ../../../jars/log4j-core-2.8.2.jar log4j-core-2.8.2.jar; ln -s ../../../jars/logredactor-2.0.7.jar  logredactor-2.0.7.jar' Cheers, TK

Running into this? ERROR StatusLogger Log4j2 could not find a logging implementation. Please add log4j-core to the classpath. Using SimpleLogger to log to the console… Solve it with this: [root@awx01 ansible]# ansible 'cm*' -m shell -a 'cd /opt/cloudera/parcels/CDH/lib/oozie/libtools; ln -s ../../../jars/log4j-core-2.8.2.jar log4j-core-2.8.2.jar; ln -s ../../../jars/logredactor-2.0.7.jar  logredactor-2.0.7.jar' Cheers, TK

The commands to allow multicast traffic with firewalld are: firewall-cmd –permanent –direct –add-rule ipv4 filter INPUT 0 -m pkttype –pkt-type multicast -j ACCEPT firewall-cmd –permanent –direct –add-rule ipv6 filter INPUT 0 -m pkttype –pkt-type multicast -j ACCEPT Cheers, TK  

Getting this? [06/Jul/2019 19:49:28 +0000] 2245 MainThread agent        ERROR    Heartbeating to cm-r01nn01.mws.mds.xyz:7182 failed. Traceback (most recent call last):   File "/opt/cloudera/cm-agent/lib/python2.7/site-packages/cmf/agent.py", line 1387, in _send_heartbeat     self.cfg.max_cert_depth)   File "/opt/cloudera/cm-agent/lib/python2.7/site-packages/cmf/https.py", line 139, in __init__     self.conn.connect()   File "/opt/cloudera/cm-agent/lib/python2.7/site-packages/M2Crypto/httpslib.py", line 69, in connect     sock.connect((self.host, self.port))   File […]

Getting this error when connecting cloudera-scm-agents to the server? [06/Jul/2019 16:16:55 +0000] 23442 MainThread agent        ERROR    Heartbeating to srv-c01.mws.mds.xyz:17182 failed. Traceback (most recent call last):   File "/opt/cloudera/cm-agent/lib/python2.7/site-packages/cmf/agent.py", line 1387, in _send_heartbeat     self.cfg.max_cert_depth)   File "/opt/cloudera/cm-agent/lib/python2.7/site-packages/cmf/https.py", line 139, in __init__     self.conn.connect()   File "/opt/cloudera/cm-agent/lib/python2.7/site-packages/M2Crypto/httpslib.py", line 69, in […]

Getting this? haproxy-systemd-wrapper[17526]: [WARNING] 186/151058 (17527) : Setting tune.ssl.default-dh-param to 1024 by default, if your workload permits it you should set it to at least 2048. Please set a value >= 1024 to make this warning disappear. add this to your haproxy config: global         log             […]