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Rjak's questions

Martin Hope
Rjak
Asked: 2017-08-04 18:44:19 +0800 CST
  • 0

I want to allow smartphone apps I'm developing to communicate with my local development server by domain name when I am working in my home office.

I have installed a DNS server on my Synology NAS and generally it is working well for non-development resources. Development is problematic. I have created a master zone and records underneath it. The problem is that our wildcard SSL certificate only works for our public domain name (call it foo.com). This means I cannot speak HTTPS locally and I would prefer my development environment to be as close as possible to production, so I want HTTPS.

What I want is for the local DNS server to resolve queries for my development server (mydev.foo.com), and forward all other queries to the upstream DNS server. For example:

mydev.foo.com -> 192.168.1.3 (my local VM, resolved locally)
foo.com -> xxx.xxx.xxx.xxx (our public website, resolved by my ISP)
bar.foo.com -> xxx.xxx.xxx.xxx (our public app server, resolved by my ISP)

Right now if I set up a foo.com master zone (a forward zone), only the locally defined resource is resolved.

Is what I'm asking even possible?

networking
Martin Hope
Rjak
Asked: 2017-03-17 07:55:31 +0800 CST
  • 4

I have an EC2 node running Ubuntu 14.04. On a deploy this morning, I received the following error message from git fetch:

error: unable to create temporary file: No space left on device

I logged into the server and df -h indicates I have plenty of space:

$ df -h
Filesystem      Size  Used Avail Use% Mounted on
udev            492M   12K  492M   1% /dev
tmpfs           100M  488K   99M   1% /run
/dev/xvda1      7.8G  4.9G  2.5G  67% /
none            4.0K     0  4.0K   0% /sys/fs/cgroup
none            5.0M     0  5.0M   0% /run/lock
none            497M  4.0K  497M   1% /run/shm
none            100M     0  100M   0% /run/user

Am I misreading df here? My understanding has been that /tmp on EC2 is resident on /dev/xvda1, but maybe I'm wrong?

hard-drive ubuntu amazon-ec2 tmp
Martin Hope
Rjak
Asked: 2015-09-23 08:33:22 +0800 CST
  • 0

We have a robotic coffee barista deployed at the Dell campus in North Austin, with internet service through Time Warner Cable.

We have been fighting intermittent connection losses between 10PM - 1AM for 3 of the past 5 nights. Time Warner has been analyzing and has issued two tech dispatches. From their end, everything looks perfect.

I am a programmer and we are a startup, so I am nowhere near a networking expert, but I'm the only one even close to capable of figuring this problem out.

Last night I observed the following:

OSX Yosemite Laptop A Connected To Internet Directly Through Cable Modem

  • 20% - 30% packet loss pinging our us-east EC2 instance.
  • 0% packet loss pinging google.com.
  • 0% packet loss pinging wired.com.

iPhone B Connected To Internet Via LTE

  • 0% packet loss all around (one little blip of 2.2% packet loss on 45 packets to google, but every other test to google and wired and our server showed 0%).

Windows 7 Laptop C Connected To Internet through iPhone B's LTE

  • 0% packet loss all around.

Laptop A Through My Home Time Warner Connection

  • 0% packet loss all around.

Ubuntu 14.04.03 Laptop D Through my Home Time Warner Connection

  • 0% packet loss all around.

I know internet routes vary packet-to-packet, but I do not have the networking experience to explain this, let alone solve it. Since the whole point of the business is ordering coffee remotely via phone, our internet connection is our lifeline. We have been engaging our cellular backup as needed, so our customers are unaffected, but I need to figure this out, or hire someone who can help figure it out.

I read that there was a major AWS outage this weekend. We have applied for business support from AWS, but I'm suspicious that will not bear fruit.

amazon-ec2