In case you're not familiar with #metabase

Running Metabase on another port

By default Metabase will launch on port 3000, but if you prefer to run the application on another port you can do so by setting the following environment variable:

export MB_JETTY_PORT=3500
 java -jar metabase.jar

In this example once the application starts up you will access it on port 3500 instead of the default port of 3000.


#metabase #port #jetty_port

https://medium.com/mongoaudit/how-to-enable-tls-ssl-on-mongodb-d973a92cefa6

#database #mongodb #mongo #tls #ssl #lets_encrypt

Turn MySQL table into utf8mb4 to store emojis:

ALTER TABLE YOUR_TABLE convert to character set utf8mb4 collate utf8mb4_general_ci;

Moreover you also need to change column character set:

ALTER TABLE YOUR_TABLE CHANGE YOUR_COLUMN_NAME YOUR_COLUMN_NAME  VARCHAR(250) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci;

Be careful that now you have to do more things like set character set after connection initiation in Python:

your_mysql_client = MySQLdb.connect(...)
 your_mysql_client.set_character_set('utf8mb4')

Now before executing your query you also need to set character set on cursor:

my_cursor.execute("SET NAMES utf8mb4;")
 my_cursor.execute(YOUR_QUERY)

#database #mysql #character_set #utf8mb4 #cursor #emoji

https://www.aaflalo.me/2016/09/dehydrated-bash-client-lets-encrypt/

#ssl #web #lets_encrypt #free_ssl #dehydrated

404 Error Pages

If you have followed our MongoDB SSL configuration, you should by now know that we can generate SSL certificate using lets encrypt. I have used dehydrated that fully matches with cloud flare.

To make the procedure automatic I have created a sample shell script that after automatic renewal will also renew the PEM files for MongoDB

#! /bin/bash

echo 'Binding new mongo private key PEM file and Cert PEM file...'
cat /etc/dehydrated/certs/mongo.example.com/privkey.pem /etc/dehydrated/certs/mongo.example.com/cert.pem > /etc/ssl/mongo.pem
echo 'Saved the new file in /etc/ssl/mongo.pem'

sudo touch /etc/ssl/ca.pem
sudo chmod 777 /etc/ssl/ca.pem
echo 'truncate ca.pem file and generate a new in /etc/ssl/ca.pem...'
sudo truncate -s 0 /etc/ssl/ca.pem
echo 'generate a ca.pem file using opessl by input -> /etc/ssl/ca.crt'
sudo openssl x509 -in /etc/ssl/ca.crt -out /etc/ssl/ca.pem -outform PEM
echo 'ca.pem is generated successfully in /etc/ssl'

echo 'append the chain.pem content to newly created ca.pem in /etc/ssl/ca.pem'
sudo cat /etc/dehydrated/certs/mongo.example.com/chain.pem >> /etc/ssl/ca.pem
echo 'done!'

#mongodb #mongo #ssl #pem #openssl #lets_encrypt

Today I fixed a really C**Py bug which have been bugged me all days and years, nights and midnights!

I use a scheduler to to get data from MongoDB and one the servers is outside of Iran and another in Iran. When I want to get data sometimes querying the db takes forever and it freezes the data gathering procedure. I had to restart (like windows) to reset the connection. I know it was stupid! :|

I found the below parameter that you can set on your pymongo.MongoClient:

socketTimeoutMS=10000

socketTimeoutMS: (integer or None) Controls how long (in milliseconds) the driver will wait for a response after sending an ordinary (non-monitoring) database operation before concluding that a network error has occurred. Defaults to `None` (no timeout).
When you don't set it it means no timeout! So I set it to 20000 Ms (20 Sec) in order to solve this nasty problem.

#mongodb #mongo #socketTimeoutMS #timeout #socket_timeout

In Grafana if you are connected to MySQL you need to provide 3 value in your select query. One is time which must be called time_sec, the other is countable value which must be called value and the other is the label that is displayed on your graph which must be called metric:

SELECT
   UNIX_TIMESTAMP(your_date_field) as time_sec,
   count(*) as value,
   'your_label' as metric
 FROM table
 WHERE status='success'
 GROUP BY your_date_field
 ORDER BY your_date_field ASC

To read more about Grafana head over here:

- https://docs.grafana.org/features/datasources/mysql/#using-mysql-in-grafana


#mongodb #mongo #mysql #grafana #dashboard #chart

#podcast #part19 #classpass

سلام صبحتون بخیر
دوستانی که قبل از عید در مورد کلاسهای خصوصی سوالاتی می پرسیدند خدمتشون باید عرض کنم که تدریس خصوصی مباحث تخصصی زیر رو میتونم از خرداد به بعد با توجه به مشغله کمتر براشون ارائه بدم:

- پایتون
- مونگو دی بی
- میکرو سرویس

جهت ارتباط با بنده از طریق آی دی @alirezastack ارتباط بگیرید.

مرسی از همراهی همه دوستان 💐

In order to verify that you certificate is generated successfully in openssl:

openssl verify -verbose -CAfile /etc/ssl/ca.pem /etc/ssl/mongo.pem

#openssl #verify #pem #ca #mongodb #ssl

https://docs.mongodb.com/manual/tutorial/change-hostnames-in-a-replica-set/#replica-set-change-hostname-downtime

#mongodb #replication #replica #change_hostname #hostname