60 votes
Accepted

I changed my TTL from 24 hours to 5 minutes. Do I need to wait 24 hours before changing the records?

Anyone who has a cached copy of the domain record will not bother updating it for 24 hours, so yes if your intent is to have at most a 5 minute window of unavailability you should wait until all of ...
Jeff Meden's user avatar
39 votes

I changed my TTL from 24 hours to 5 minutes. Do I need to wait 24 hours before changing the records?

It's (potentially) even worse than that -- you have to wait 24 hours after all of your authoritative servers have updated. The normal way for updates to happen is that you make a change to the zone on ...
Gordon Davisson's user avatar
23 votes

I changed my TTL from 24 hours to 5 minutes. Do I need to wait 24 hours before changing the records?

Yes, you should wait. Even then of course it's not guaranteed that everyone will respect the TTL.
Sven's user avatar
  • 99.5k
12 votes
Accepted

Meltdown & Spectre - Does patching the guest kernel of an unpatched hypervisor prevent cross-VM memory leaks?

From what I understand of the vulnerabilities, no - the speculative caching attacks bypass all of the CPU's protections against a process grabbing memory from whatever arbitrary address. I believe ...
Shane Madden's user avatar
5 votes

I changed my TTL from 24 hours to 5 minutes. Do I need to wait 24 hours before changing the records?

In addition to the other answers, you can use https://www.whatsmydns.net/ to check how your DNS record is propagating in almost real time.
Madis Nõmme's user avatar
5 votes

I changed my TTL from 24 hours to 5 minutes. Do I need to wait 24 hours before changing the records?

Pulling together various comments and answers the complete procedure would be something like. Make sure you can update your authoratative servers in a timely manner. Reduce the TTL. Check all ...
Peter Green's user avatar
  • 4,296
3 votes
Accepted

Checking SMTP headers for spoofed email (did client authenticate?)

Key line is here. Received: from [77.234.42.143] (port=65110 helo=[100.100.48.14]) by a2plcpnl0576.prod.iad2.secureserver.net with esmtpsa (TLSv1:DHE-RSA-AES256-SHA:256) (Exim 4.85_1) ...
sanmai's user avatar
  • 541
3 votes

Prevent spoofing - SPF, DKIM, DMARC in place

Unfortunately, there is nothing you can do about spammers spoofing your domain. The mechanisms you mentioned (SPF, DKIM, and DMARC) are all used to assist the receiving servers in determining if the ...
Appleoddity's user avatar
  • 3,860
3 votes

Server Move From Rackspace to AWS Cloud

The poorly named AWS Application Migration Service based on CloudEndure is probably your best bet to migrate a server to AWS. It doesn't migrate applications, as such, it migrates virtual machines. ...
Tim's user avatar
  • 32.8k
3 votes

Server CPU issues, msiexev.exe a culprit?

If the file is literally called 'msiexev.exe' (with a V), you've been infected with some sort of malware. And when you login and open task manager, it's basically trying to hide itself by backing off ...
Ryan Bolger's user avatar
  • 16.8k
2 votes
Accepted

salt-cloud & Rackspace: How to attach Private Networks to new instances?

I just tested this. Here's my working provider config cat /etc/salt/cloud.providers.d/rackspace.conf rs: minion: master: <master ip or url> # Configure Rackspace using the OpenStack ...
Utah_Dave's user avatar
  • 532
1 vote
Accepted

Rackspace yum install git cURL 443 Connection refused

the easy answer: give us a call or submit a ticket and we can look at your firewall to see what's going on. the DIY answer: since you can reach "https://github.com" but not "https://...
Joe A's user avatar
  • 300
1 vote

How do I not lose my Rackspace emails when I use WordPress DNS?

Don't move your DNS to WP. Point the DNS records for your website to WP.
joeqwerty's user avatar
  • 111k
1 vote

What setting will I need to change when switching hosts and registrar at the same time?

I found this article which is everything I was typing up as a reply. The Short Version Create a list of DNS records from your current DNS provider (likely to be NetSol, but could be someone else, ...
Joe A's user avatar
  • 300
1 vote

Rackspace cloud loadbalancer

Your Cloud Load Balancer won't inspect traffic to find a Host header. You could effectively deny traffic for example.net by forcing SSL if you have a cert for example.com; you'd set the LB to HTTPS ...
Joe A's user avatar
  • 300
1 vote

Unable to connect to Ubuntu on port 3306 (MySQL) on Rackspace instance

My solution was to reinstall ufw. apt purge ufw apt install ufw Then add port 3306.
Percy Riquelme's user avatar
1 vote

Unable to connect to Ubuntu on port 3306 (MySQL) on Rackspace instance

In general, you should consider 1) MySQL bind-address, and 2) the firewall. Since you aren't able to make a connection with telnet SERVER_IP 3306, either the firewall is blocking the connection or ...
Joe A's user avatar
  • 300
1 vote

How can Rackspace cloud servers be set up with an EC2 type approach to firewalls?

Rackspace now has Security Groups! Before this, though, it would certainly be possible to use a Linux box as a firewall. The Vyatta server image is designed just for this purpose—though it's not a "...
Joe A's user avatar
  • 300

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