1. Boot server/VM in BIOS mode and change Boot Mode to CD
2. Boot server/VM from Linux CD
3. Hit F5 to enter Rescue Mode.
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1. Boot server/VM in BIOS mode and change Boot Mode to CD
2. Boot server/VM from Linux CD
3. Hit F5 to enter Rescue Mode.
1. Boot server/VM in BIOS mode and change Boot Mode to CD
2. Boot server/VM from Linux CD
3. Hit F5 to enter Rescue Mode.
This only works if mydomain.com is not the domain configured in Postfix. Because Postfix thinks everything is local when you configured it to be local.
To fix this problem modify Postfix main.cf file:
mydestination = localhost.localdomain, localhost
fallback_transport = relay
Vulnerability Issue:
A flaw was found in the way BIND handled requests for TKEY DNS resource records. A remote attacker could use this flaw to make named (functioning as an authoritative DNS server or a DNS resolver) exit unexpectedly with an assertion failure via a specially crafted DNS request packet.
You can configure the ssh client to automatically send a protocol no-op code code every so many seconds so that the server won’t disconnect you. This is setting is sometimes referred to as Keep-Alive.
Follow these steps to boot in Single User mode in Ubuntu 12.04:
Step 1: Reboot the server and press “shift” key continuously to get the grub loader screen.
Step 2: In the Grub2 menu, select the first line with Linux x.x.x.x-generic.
On January 27, 2015, the GHOST vulnerability was announced by Qualys. This vulnerability allows remote attackers to take complete control of a system by exploiting a buffer overflow bug in a glibc function GetHOST. This vulnerability should be considered serious and all affected servers should be patched immediately.
Install vsftpd
The vsftpd server is available in CentOS’s default repositories. We can install it by typing:
sudo yum install vsftpd
The vsftpd server is now installed on our VPS. We can configure some connections options in the next section.
To generate your CSR, you will need to log in to your server and use the OpenSSL software to generate a CSR and private key.
openssl req -nodes -newkey rsa:2048 -sha1 -keyout myserver.key -out server.csr