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Permission denied (publickey) when SSH Access to Amazon EC2 instance [closed]
...rwise, if ec2-user and root don't work, check with your AMI provider.
Finally, be aware that there are many other reasons why authentication would fail. SSH is usually pretty explicit about what went wrong if you care to add the -v option to your SSH command and read the output, as explained in ma...
How to call base.base.method()?
...Derived
{
public override void Say()
{
Console.WriteLine("Called from Special Derived.");
var ptr = typeof(Base).GetMethod("Say").MethodHandle.GetFunctionPointer();
var baseSay = (Action)Activator.CreateInstance(typeof(Action), this, ptr);
baseSay(...
How should one use std::optional?
...std::string s, int& i);
Another way that this could be done is especially bad:
int* try_parse_int(std::string s); //return nullptr if fail
This requires dynamic memory allocation, worrying about ownership, etc. - always prefer one of the other two signatures above.
Another example:
clas...
Difference between getDefaultSharedPreferences and getSharedPreferences
...es a default preference-file name. This default is set per application, so all activities in the same app context can access it easily as in the following example:
SharedPreferences spref = PreferenceManager.getDefaultSharedPreferences(this);
if (spref.contains("email")) {
String sEmailAdd...
How to install a specific version of a ruby gem?
Using the command-line gem tool, how can I install a specific version of a gem?
6 Answers
...
How to filter object array based on attributes?
...art of the new ECMAScript 5th Edition standard, and can be found on almost all modern browsers.
For IE, you can include the following method for compatibility:
if (!Array.prototype.filter) {
Array.prototype.filter = function(fun /*, thisp*/) {
var len = this.length >>> 0;
if (ty...
Is there a way to use SVG as content in a pseudo element :before or :after
...
<div class="author_">Lord Byron</div>
.author_ { font-family: 'Playfair Display', serif; font-size: 1.25em; font-weight: 700;letter-spacing: 0.25em; font-style: italic;
position:relative;
margin-top: -0.5em;
color: bla...
Difference between object and class in Scala
...ompanion object of class C; note that the companion object is not automatically an instance of C.
Also see Scala documentation for object and class.
object as host of static members
Most often, you need an object to hold methods and values/variables that shall be available without having to firs...
Correct way to use get_or_create?
...f the fields have to be included in defaults. In case CREATE event occurs, all the fields are taken into consideration.
It looks like you need to be returning into a tuple, instead of a single variable, do like this:
customer.source,created = Source.objects.get_or_create(name="Website")
...
is not JSON serializable
...fe tage. stackoverflow.com/a/57939897/4157431
– Rami Alloush
Sep 14 '19 at 23:01
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