Configure ubuntu on digitalocean so that URL of main domain without www in front can work [closed]

I have a Ubuntu 20.04.3 LTS virtual machine running nginx/1.18.0 on DigitalOcean.

Currently, when I key in the URL https://www.main-domain.com, it works. However, when I key in the URL https://main-domain.com, I get the following error;

This site can’t be reached. main-domain.com’s server IP address could not be found.

I am not sure whether this is a DNS or nginx problem.

How can I configure the digitalocean Ubuntu VM such that the URL https://main-domain.com without the www in front works?

How do you install and solve the configure step from source in grid db?

I am running Ubuntu 18 and the error following installation instructions persists

top@DESKTOP-JUACTCP:~/griddb$   sudo ./configure checking for a BSD-compatible install... /usr/bin/install -c checking whether build environment is sane... yes checking for a thread-safe mkdir -p... /bin/mkdir -p checking for gawk... gawk checking whether make sets $  (MAKE)... no checking whether make supports nested variables... no checking for gcc... no checking for cc... no checking for cl.exe... no configure: error: in `/home/top/griddb': configure: error: no acceptable C compiler found in $  PATH See `config.log' for more details 

How to configure Oracle traffic director for full site failover to have high availability?

I have two server system, each server having both apache tomcat server(deployed web app) and oracle 11g database server. The database on the two server is synchronised by oracle data gaurd for high availibility. tomcat Web servers is running individually on each server system with no load balancing. One server acts as primary server and other server acts as redundant server.

Usually for any failure on primary server, I have to manually change the IP/Domain name to access the other server.

I have came across Oracle Traffic director which may solve my isssue to switch any client request to redundant server in case of failure of primary server. Since I am new to oracle traffic director, can any one guide me to configure otd for full site failover?

What sequence of actions has to be taken in order to configure DB2 UDB SMTP mail?

I read https://www.ibm.com/support/knowledgecenter/SSEPGG_9.7.0/com.ibm.db2.luw.sql.rtn.doc/doc/r0055176.html and tried to run the command provided in the article, even though I fully expect SMTP to not work because my server requires a user name and password authentication that the command is missing.

So, just to try it out, I fired off:

db2 update db cfg using smtp_server 192.168.0.12 

It threw this error:

SQL1024N  A database connection does not exist.  SQLSTATE=08003 

Are there any prerequisites to the above command that I am missing?

And once we get this to work with the community’s help, how are we supposed to provide user name and password for the SMTP server in DB2 UDB?

openssl: How to configure private key size for secp256k1

I am trying to understand if it’s possible to configure a private key size for the given curve.

openssl ecparam -name secp256k1 -genkey  -----BEGIN EC PARAMETERS----- BgUrgQQACg== -----END EC PARAMETERS----- -----BEGIN EC PRIVATE KEY----- MHQCAQEEIMda3jdFuTnGd2Y9s9lZiQJXKSpxBp6WQWcurn4FnYogoAcGBSuBBAAK oUQDQgAEI272v3lIoVkLZEbsJ/1l6Wfqbk8ZeybzzhtUN60EOhCRsR8rOLAIbbDl ncOT1vtzEj5NZxQEYdopFMb10CfccQ 

Was trying to read openssl documentation to see how to configure the length of the private key but failed to find anything regarding it. Could you advise?

Is it possible to configure SMTP relay on SSRS 2012 RTM?

I am trying to configure SSRS 2012 RTM to work with user and password to a remote SMTP server. In 2016 its working just fine but for some reason on 2012 it doesn’t- when i add the SMTP configuration below and then i try to create an SSRS subscription it will not allow sending subscriptions that are not file share subscriptions. IS this feature supported in 2012? (SMTPAuthenticate= 1)

configuration file SMTP setup: enter image description here

I also checked the error logs and could not find an error. Thanks In advance