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Add Keypair to existing EC2 instance
...file system (still on instance-B):
sudo umount /vol-a
sudo rmdir /vol-a
Now, back on your system with ec2-api-tools, continue moving the EBS volume back to it’s home on the original instance A and start the instance again:
ec2-detach-volume $volume
ec2-attach-volume --instance $instance_a --de...
Best approach to real time http streaming to HTML5 video client
... EDIT 3: As of IOS 10, HLS will support fragmented mp4 files. The answer
now, is to create fragmented mp4 assets, with a DASH and HLS manifest. > Pretend flash, iOS9 and below and IE 10 and below don't exist.
Everything below this line is out of date. Keeping it here for posterity.
EDIT...
Why were pandas merges in python faster than data.table merges in R in 2012?
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It looks like Wes may have discovered a known issue in data.table when the number of unique strings (levels) is large: 10,000.
Does Rprof() reveal most of the time spent in the call sortedmatch(levels(i[[lc]]), levels(x[[rc]])? This isn't really the join itself (t...
Is it possible to start a shell session in a running container (without ssh)
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EDIT: Now you can use docker exec -it "id of running container" bash (doc)
Previously, the answer to this question was:
If you really must and you are in a debug environment, you can do this: sudo lxc-attach -n <ID>
Note th...
Handling file renames in git
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In git 1.9.1 git status now behaves like git commit.
– Jacques René Mesrine
Oct 5 '15 at 16:11
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Create a devise user from Ruby console
...e, make sure you are setting the confirmed_at value to something like Time.now while creating.
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Postgresql: password authentication failed for user “postgres”
... user as "postgres" and password "postgres", because it worked before. But now authentication is failed. I did it before a couple of times without this problem. What should I do? And what happens?
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What are detached, persistent and transient objects in hibernate?
...ng it with a Session:
Long id = (Long) session.save(person);
// person is now in a persistent state
Now, if we close the Hibernate Session, the persistent instance will become a detached instance: it isn't attached to a Session anymore (but can still be modified and reattached to a new Session la...
constant pointer vs pointer on a constant value [duplicate]
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Now that you know the difference between char * const a and const char * a. Many times we get confused if its a constant pointer or pointer to a constant variable.
How to read it? Follow the below simple step to identify bet...
Freeze screen in chrome debugger / DevTools panel for popover inspection?
... (by hovering or however) and wait until Chrome breaks into the Debugger.
Now click on the Elements tab in the Chrome Inspector, and you can look for your element there.
You may also be able to click on the Find Element icon (looks like a magnifying glass) and Chrome will let you go and inspect an...