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Showing posts from September, 2018

NTP Configuration on RHEL

NTP Configuration: use the below script to configure your RHEL 7.x server for using public NTP from Google and ntp.org Asia pool. #/bin/bash rhel_version=`cat /etc/redhat-release` rhel='Red Hat Enterprise Linux' version7='release 7' index=`awk -v a="$rhel_version" -v b="$rhel" 'BEGIN{print index(a,b)}'` if [ $index -ne 0 ]; then     index=`awk -v a="$rhel_version" -v b="$version7" 'BEGIN{print index(a,b)}'`     if [ $index -ne 0 ]; then         echo "Disable chronyd deamon."         systemctl stop chronyd         systemctl disable chronyd         echo "Install ntpd deamon."         yum install ntp -y         systemctl enable ntpd         echo "Start ntpd deamon."         systemc...

Repair Oracle VM Manager

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  Issue Summary: Previously the Oracle VM Manager v3.4 was installed on a Desktop with CentOS as the Operating System. Due to HDD crash, the OVM Manager system was rendered unoperational hence there was no control about managing & monitoring of the Oracle VMs running on the OVS Hypervisors. Resolution and recovery: Logged to one of the OVS Hypervisor Server - myovs4 (172.xx.xx.4) via SSH using root credentials. Changed to /etc/ovs-agent/db folder & run ovs-agent-db dump_db server It will output the details as - [root@myovs4 db]# ovs-agent-db dump_db server {'cluster_state': 'DLM_Ready', 'clustered': True, 'fs_stat_uuid_list': ['0004fb0000050000c7804237916f0bde'], 'is_master': False, 'manager_event_url': 'https://172.xx.xx.8:7002/ovm/core/wsapi/rest/internal/Server/6c:7b:a9:3d:ff:f2:11:e6:83:eb:00:0a:f7:af:ee:ac/Event', 'manager_ip': '172.xx.xx.8', 'manager_statistic_url': 'https://1...