AWS news analysis and DevOps guides.

AWS news analysis and DevOps guides from the engineers who run production AWS for regulated teams. The Linux and sysadmin archive goes back to 2009.

CentOS

The path “” is not a valid path to the kernel headers

14 June 2016·1 min readArchive

Issue You are trying to install vmware-tools on RHEL / CentOS 7 You are stuck with the below error. The path “” is not a valid path to the 3.10.0-327.el7.x86_64 kernel headers. Solution You have to...

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RHEL

fatal: parameter inet_interfaces: no local interface found for ::1

11 June 2016·1 min readArchive

Issue You are note able to restart / start postfix and getting the below error. fatal: parameter inet_interfaces: no local interface found for ::1 Solution Edit the file /etc/postfix/main.cf vim...

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Hot News

DROWN – Cross-protocol attack on TLS using SSLv2

2 March 2016·1 min readArchive

Its the time for another openssl update, Update your openssl and openssl-libs packages with below commands. RHEL / CentOS / OEL (rpm based) yum update openssl Ubuntu / Debian Based (apt based)...

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AWS

CentOS 7 / RHEL 7 – AWS ec2 – how to set hostname persistent across reboots

7 February 2016·1 min readArchive

Issue how to set hostname persistent across reboots in CentOS 7 / RHEL 7 on AWS ec2 CentOS 7 / RHEL 7 Hostname changes after reboots in aws ec2 Solution Set the hostname with the below command...

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Hot News

Copy and CudaDrive services will be discontinued

3 February 2016·1 min readArchive

Copy.com (an alternative to Dropbox) by Barracuda announced today that the Copy and CudaDrive services will be discontinued on May 1, 2016. You can migrate your existing data from copy.com to Ondrive...

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SysAdmin

Sudo access to a single service – RHEL 7 / CentOS 7

24 January 2016·1 min readArchive

Issue You need to give only the apache / httpd restart permission to the developers via sudo. Solution Add the below lines to /etc/sudoers Cmnd_Alias WEBDEVS = /sbin/service httpd * user1 ALL =...

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SysAdmin

PPTP VPN with CSF firewall

17 January 2016·1 min readArchive

Issue PPTP VPN is not working after installing CSF firewall. How to allow PPTP in cPanel server with CSF firewall ? Solution Create a file /etc/csf/csfpre.sh with the below contents. iptables -A...

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Hot News

OpenSSH – Information-leak vulnerability (CVE-2016-0777)

16 January 2016·1 min readArchive

Vulnerability Since version 5.4, the OpenSSH client supports an undocumented feature called roaming. If a connection to an SSH server breaks unexpectedly, and if the SSH server supports roaming as...

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Hot News

AWS Workmail – Now Generally Available

15 January 2016·1 min readArchive

AWS workmail now generally available. 4 usd / month / mailbox with exchange/ Active Sync Connectivity Read more from AWS blog

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RHEL

How to Change the boot order in grub2 RHEL / CentOS 7

14 January 2016·1 min readArchive

Issue How to change the boot order in RHEL 7 / CentOS 7 / OEL 7 How to set default boot to windows on Dual boot on the above environments. Solution In boot menu, the number starts with 0, so the 3rd...

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SysAdmin

CentOS / RHEL – 7 How to set hostname permanently

30 November 2015·1 min readArchive

Issue How to set hostname in CentOS-7 / RHEL-7 persistent across reboots. – I have changed /etc/hostname and it changes after reboot. Solution In CentOS / RHEL-7 you need to use the...

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Scripts

RBL Blacklist check script with email alert – cPanel / WHM – Mail Servers

3 November 2015·1 min readArchive

Issue How to check my cPanel / WHM server IPs against RBL ? How to prevent my mail server IPs from being blacklisted ? My cPanel server IP is blacklisted. I need an email alert on blacklisting my IPs...

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