Why RHEV guests fails when booting via PXE + dnsmasq?

  • Adding the following line to dnsmasq.conf resolves the issue
dhcp-no-override

Root Cause

  • A potential issue may exist when trying to find the boot filename when using gPXE + dnsmasq.
--dhcp-no-override
              (IPv4  only)  Disable re-use of the DHCP servername and filename
              fields as extra option space. If it can, dnsmasq moves the  boot
              server  and  filename  information (from dhcp-boot) out of their
              dedicated fields into DHCP options. This make extra space avail‐
              able in the DHCP packet for options but can, rarely, confuse old
              or broken clients. This flag forces "simple and safe"  behaviour
              to avoid problems in such a case.

Comments

Post a Comment

Popular posts from this blog

How to clean all the foreman task and locked task

1.- First make su to postgres user su -s /bin/bash - postgres  2.-Execute psql psql  3.- connect to the foreman database \c foreman;  4.- Delete all the foreman task and foreman task locks delete from foreman_tasks_tasks;  delete from foreman_tasks_locks;  5.- Quit from postgres and exit \q  exit  6. Restart all the services for s in {qpidd,pulp_celerybeat,pulp_ resource_manager,pulp_workers, httpd}; do sudo service $s restart; done  Update in todays foreman you can clean the task using the following command: foreman-rake foreman_tasks:cleanup
Read more

CentOS 7 Server Hardening Guide

CentOS 7 Server Hardening Guide 1. System Settings – Disk Partitioning and Post installation 1.1 Disk Encryption with Kickstart The easiest way to encrypt a partition is during Kickstart installation. This can be achieved by adding the –encrypted and –passphrase= options to the definition of a physical LVM volume. Our Kickstart template is provided below. Note that the template requires a 32GB disk. #version=CentOS7.5 # System authorisation information auth --enableshadow --passalgo=sha512 # Use CDROM installation media cdrom ignoredisk --only-use=sda # Keyboard layouts keyboard --vckeymap=gb --xlayouts='gb' # System language lang en_GB.UTF-8 # SELinux selinux --enforcing # Network information network --bootproto=dhcp --device=eth0 --onboot=on --activate network --hostname=ks-c7.example.com # Plaintext root password: PleaseChangeMe rootpw --iscrypted $6$nS0mBJyS$q/QgCof5unWrT9W3qngTISueSDhDHVNntDqd8sOcgmHp2lq4f/niUbjCmoEzaf3EWQ2x3z/k0eIZa
Read more

How to restrict users to send only mail to the local domain in Zimbra

How to restrict users to send only mail to the local domain in Zimbra 1. Open file /opt/zimbra/conf/zmconfigd/smtpd_recipient_restrictions.cf and add this line below reject_non_fqdn_recipient. This is example on my system permit_sasl_authenticated check_sender_access lmdb:/opt/zimbra/postfix/conf/restricted_senders permit_mynetworks 2. Open file /opt/zimbra/conf/zmconfigd.cf and add those lines before RESTART mta. This is example on my system POSTCONF smtpd_restriction_classes local_only POSTCONF local_only FILE postfix_check_recipient_access.cf RESTART mta 3. Create a file /opt/zimbra/conf/postfix_check_recipient_access.cf and add the following line.  check_recipient_access lmdb:/opt/zimbra/postfix/conf/local_domains, reject 4. Create a file "/opt/zimbra/postfix/conf/restricted_senders" and list all the users, whom you want to restrict. Follow this syntax: user@yourdomain.com local_only 5. Create a file "/opt/zimbra/postfix/con
Read more