Ran into this issue today, and a fast fix. [root@xyz ~]# yummut_tas:172, pid: 16043, flag: 19error: db5 error(-30973) from dbenv->failchk: BDB0087 DB_RUNRECOVERY: Fatal error, run database recoveryerror: cannot open Packages index using db5 – (-30973)error: cannot open Packages database in /var/lib/rpmCRITICAL:yum.main: Error: rpmdb open failed[root@xyz ~]# rpm –rebuilddb [root@xyz~]# rpm –rebuilddb[root@xyz ~]# yumLoaded plugins: search-disabled-reposYou […]

Kerberos and Java

I have worked on a kerberos smoke test for my team. I learned a few tips in the process. The useTicketCache is a preferred use in case the java process dies while the KDC is down. HBase Canary Testing runs on a kerberos enabled cluster using hbase canary If you are port forwarding over SSH, […]

Forwarding DGram in node.js

For a project I am working on I needed to rewrite a DGram port. I moved the ports around and found a few quick tests. Testing with NC my-machine:~$ echo -n “data-message” | nc -v -4u -w1 localhost 88found 0 associationsfound 1 connections:1: flags=82<CONNECTED,PREFERRED> outif (null) src port 53862 dst port 88 rank […]

COS and Hadoop FS issue

I ran into this issue with Python and IBM Cloud Object Storage. I applied a quick fix: pyspark –packages

Kafka, Zookeeper… and Kerberos

My team runs a Kafka service for data ingestion, we ran across a rare timeout when our main Key Distribution Center (KDC) went down. When the zookeeper service restarted, zookeeper worked flawlessly. I checked the services with the zookeeper four-letter commands. However, the kafka-broker/zookeeper startup and authentication failed and the brokers went down. We checked […]