Header Shadow Image

Archive for the 'NIX Posts' Category

SAN: High Level Overview

A picture says a thousand words:  

Cannot add dependency job for unit firewalld.service, ignoring: Unit firewalld.service is masked.

Restore firewalld.service file contents. [root@idmipa01 ~]# systemctl enable firewalld Failed to execute operation: Operation not supported [root@idmipa01 ~]#  [root@idmipa01 ~]# systemctl enable firewall Failed to execute operation: Access denied [root@idmipa01 ~]#  [root@idmipa01 system]# vi firewalld.service [root@idmipa01 system]# systemctl enable firewalld Created symlink from /etc/systemd/system/dbus-org.fedoraproject.FirewallD1.service to /usr/lib/systemd/system/firewalld.service. Created symlink from /etc/systemd/system/basic.target.wants/firewalld.service to /usr/lib/systemd/system/firewalld.service. [root@idmipa01 system]# systemctl [...]

/etc/resolv.conf is getting overwritten

So /etc/resolv.conf was getting consistently overwritten even though NetworkManager was removed using rpm -e $(rpm -aq|grep Network Manager).  To find the culprit, we checked what is running on this CentOS 7 system using:

Setting Temporary Network Addresses

Setting Temporary Network Addresses ip a add dev eth0 ip route add default dev eth0 Cheers, TK

INFO task kworker blocked for more than 120 seconds.

Well one day we get this issue (INFO task kworker blocked for more than 120 seconds.):

VMware : Unable to connect to the MKS: Login (username / password) incorrect

For this error make sure that the Windows Firewall with Advanced Security has the following two rules enabled on both the Domain and Private profiles: VMware Authd Service VMware Authd Service (private) Cheers, TK

David Korn, where are you?

Folks are asking where you are? I've wondered the same and hope to see David Korn back in action again.  Thread's been quiet.  Did some reasearch earlier and David Korn was hired by Google after departing from AT&T (http://www.unix.com/what-is-on-your-mind-/237119-david-korn-glenn-fowler-laid-off.html). No idea what's he's working on but his profile is:  https://www.linkedin.com/in/david-korn-b23185 And some chat about this [...]

Cloudera Manager Installation Issues

When getting the following errors below on the Cloudera Manager Installation on RHEL 7.2+, try both a Date and Time Configuration and stopping then starting the agent service with these commands: systemctl stop cloudera-scm-agent systemctl start cloudera-scm-agent If you get the following messages.  In the absence of a DNS server, also check and configure the /etc/hosts for [...]

Date and Time Configuration on RHEL 7, CentOS 7, Scientific Linux 7 or Fedora

yum install ntp -y; timedatectl set-ntp yes; timedatectl set-timezone America/Toronto Use timedatectl list-timezones to get your timezone. Cheers, TK

Wrap lines in journalctl output

journalctl -b –no-pager | less Easy peasy! Cheers, TK

  Copyright © 2003 - 2013 Tom Kacperski (microdevsys.com). All rights reserved.

Creative Commons License
This work is licensed under a Creative Commons Attribution 3.0 Unported License