Pupli – Page 46

Adding Hash data to Redis using StackExchange.Redis

March 17, 2022

ConnectionMultiplexer redis = ConnectionMultiplexer.Connect("localhost");
IDatabase db = redis.GetDatabase();
db.HashSet("user:user1", new HashEntry[] { new HashEntry("12", "13"), new HashEntry("14", "15") });

References
https://stackoverflow.com/questions/32708881/adding-and-retrieving-data-sets-to-redis-using-stackexchange-redis
https://redis.io/commands/HMSET
https://redis.io/commands/hset

Create Indexes in MongoDB via .NET

March 17, 2022

static async Task CreateIndexAsync()
{
    var client = new MongoClient();
    var database = client.GetDatabase("HamsterSchool");
    var collection = database.GetCollection<Hamster>("Hamsters");
    var indexKeysDefinition = Builders<Hamster>.IndexKeys.Ascending(hamster => hamster.Name);
    await collection.Indexes.CreateOneAsync(new CreateIndexModel<Hamster>(indexKeysDefinition));
}

References
https://stackoverflow.com/questions/17807577/how-to-create-indexes-in-mongodb-via-net

MongoDB.Driver.MongoAuthenticationException: Unable to authenticate using sasl protocol mechanism SCRAM-SHA-1

March 17, 2022

The issue is you are authenticating the mongoadmin user for clientdb. But mongoadmin user is authenticated to admin db. Get the mongoadmin user authenticated and then you can access clientdb.

IMongoClient _client;
        public readonly IMongoDatabase _database;

        public MongoContext_URIBased()
        {
            var mongoUrl = new MongoUrl("mongodb://mongoadmin:secret@172.17.103.158:2020/admin");
            _client = new MongoClient(mongoUrl);
            _database = _client.GetDatabase("clientdb");
        }

References
https://stackoverflow.com/questions/53756773/unable-to-connect-to-mongodb-using-authentication-using-mongocsharpdriver-2-7

Specified Encryption Algorithm on Softether Server not Working

March 10, 2022

nano vpn_server.config

Edit the config file in the server, and look for this value:

bool Tls_Disable1_3 false

Change it to the following value:

bool Tls_Disable1_3 true

That will disable TLS 1.3, and the selected cipher will work again. You can even select RC4-MD5 if you desire.

References
https://www.vpnusers.com/viewtopic.php?t=65167

Install ADB & Fastboot on Ubuntu 21.04

March 4, 2022

sudo apt install android-tools-adb android-tools-fastboot

adb version

adb devices

References
https://www.linuxbabe.com/ubuntu/how-to-install-adb-fastboot-ubuntu

Restart a Network in Ubuntu

March 4, 2022

sudo nmcli networking off
sudo nmcli networking on

References
https://itsfoss.com/restart-network-ubuntu/

Flush Routing Table in Linux

March 4, 2022

Flush all routes

sudo ip route flush table main

ip route show

Empty a routing cache

sudo ip route flush cache

sudo ip route show cache

References
https://linoxide.com/how-to-flush-routing-table-from-cache/

Assign Output of Shell Command To Variable in Bash

March 3, 2022

var=$(command-name-here)
var=$(command-name-here arg1)
var=$(/path/to/command)
var=$(/path/to/command arg1 arg2)

OR use backticks based syntax as follows to assign output of a Linux command to a variable:

var=`command-name-here`
var=`command-name-here arg1`
var=`/path/to/command`
var=`/path/to/command arg1 arg2`

Examples

## store date command output to $now  ##
now=$(date)

## alternate syntax ##
now=`date`

To display back result (or output stored in a variable called $now) use the echo or printf command:

echo "$now"
printf "%s\n" "$now"

References
https://www.cyberciti.biz/faq/unix-linux-bsd-appleosx-bash-assign-variable-command-output/

Extract substring in Bash

March 3, 2022

echo 'someletters_12345_moreleters.ext' | cut -d'_' -f 2

output

ip route show | grep default | cut -d' ' -f 3

output

178.134.45.216

References
https://stackoverflow.com/questions/428109/extract-substring-in-bash

Tweaks for Firefox

March 3, 2022

Enable Hardware Acceleration

Go to about:preferences
In General, scroll down to Performance
Uncheck the box for Use recommended performance settings
Check the box for Use hardware acceleration when available

Disable Data Collection and Telemetry

Go to about:preferences
Go to Privacy & Security, and scroll down to Firefox Data Collection and Use
Uncheck all boxes in this section
Restart Firefox

Essential About:Config Tweaks

Set browser.download.animateNotifications to False
Set security.dialog_enable_delay to 0
Set network.prefetch-next to False (Only on slow internet connections)
Set browser.newtabpage.activity-stream.feeds.telemetry to false
Set browser.newtabpage.activity-stream.telemetry to false
Set browser.ping-centre.telemetry to false
Set toolkit.telemetry.archive.enabled to false
Set toolkit.telemetry.bhrPing.enabled to false
Set toolkit.telemetry.enabled to false
Set toolkit.telemetry.firstShutdownPing.enabled to false
Set toolkit.telemetry.hybridContent.enabled to false
Set toolkit.telemetry.newProfilePing.enabled to false
Set toolkit.telemetry.reportingpolicy.firstRun to false
Set toolkit.telemetry.shutdownPingSender.enabled to false
Set toolkit.telemetry.unified to false
Set toolkit.telemetry.updatePing.enabled to false

Remove Built-in Firefox Add-ons

In about:config, set reader.parse-on-load.enabled to False
In about:config, set reader.parse-on-load.force-enabled to False
In about:config, set browser.pocket.enabled to False
In about:config, set loop.enabled to False

References
https://www.makeuseof.com/tag/speed-up-firefox-immediately-with-these-6-simple-tweaks/