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What is the relationship between the docker host OS and the container base image OS?
...ou would need some kind of virtualization within the container (qemu, kvm, etc.)
Docker manage images that are the file system representation. You can install any linux distribution or simply put binaries.
Indeed, for the convenience of the example, we often rely on the base images, but you could ...
How to count objects in PowerShell?
...re-Object; and returns a lot of other stuff -- like Average, Sum, Maximum, etc...
– BrainSlugs83
Apr 28 '17 at 18:48
...
Make a div fill the height of the remaining screen space
...nt taking up the rest screen. If so, this post may help, it works on IE7+, etc.
http://blog.stevensanderson.com/2011/10/05/full-height-app-layouts-a-css-trick-to-make-it-easier/
And here are some snippets from that post:
@media screen {
/* start of screen rules. */
/* Generic ...
What is a mutex?
...sure that only one thread is allowed inside that area, using that resource etc.
How to use them is language specific, but is often (if not always) based on a operating system mutex.
Some languages doesn't need this construct, due to the paradigm, for example functional programming (Haskell, ML are...
What columns generally make good indexes?
...ata type that can be given some meaningful order, ie sorted (integer, date etc).
It does not matter if the data in a column is generally increasing. If you create an index on the column, the index will create it's own data structure that will simply reference the actual items in your table without...
WPF: How to display an image at its original size?
...
Here is a similar question. Generally setting Stretch="None" is enough.
It is also very important what DPI has the image set in metadata. It took me quite a while before figuring out that if the image's DPI is different from the monitor's DPI (usually 96), WPF will automat...
Passing a Bundle on startActivity()?
...a String. As value you can use the primitive data types int, float, chars, etc. We can also pass Parceable and Serializable objects from one activity to other.
Intent intent = new Intent(context, YourActivity.class);
intent.putExtra(KEY, <your value here>);
startActivity(intent);
Retrieving...
What is the volatile keyword useful for?
...A is creating Singleton instance and just after creation, the CPU corrupts etc, all other threads will not be able to see the value of _instance as not null and they will believe it is still assigned null.
Why does this happen? Because reader threads are not doing any locking and until the writer...
The maximum value for an int type in Go
....MaxFloat64)
fmt.Printf("max float32= %+v\n", math.MaxFloat32)
// etc you can see more int the `math`package
}
Ouput :
max int64 = 9223372036854775807
max int32 = 2147483647
max int16 = 32767
min int64 = -9223372036854775808
min int32 = -2147483648
max flloat64= 1.7976931348623157e+308
m...
How to use OpenSSL to encrypt/decrypt files?
...se this if you need to send
data in the form of text format via email etc.
-salt
To use a salt (randomly generated) when encrypting. You always
want to use a salt while encrypting. This parameter is actually
redundant because a salt is used whether you use this or not
which is...