Amazon OpenLink Virtuoso RedHat Linux 7.x PAGO AWS AMI

[hwilliams]

Amazon OpenLink Virtuoso RedHat Linux 7.x PAGO AWS AMI

Introduction

This document details the process for deploying the OpenLink Virtuoso Pay-As-you-GO (PAGO) Edition Marketplace Offer for the Amazon AWS Marketplace.

Prerequisites

• An Amazon Web Services account

Deployment from AWS Marketplace Offer

1. Goto the AWS Marketplace Virtuoso 8.3.3319 (PAGO Edition) for RedHat Linux 7.x offer page:

2. Click on the Continue to Subscribe button to start the subscription and deployment of the PAGO offer.

3. Click on the Accept Term button to commence the deployment process in the AWS Marketplace.

4. Click on the Continue to Configuration button to subscribe to the offer

5. Select the EC2 Instance Type , VPC Settings , Subnet Settings , Security Group Settings and Key Pair Settings to be used for the deployment and click on the Launch button to launch the software. Note the Security Group used must allow access to the ports 8890 and 1111 for HTTP and SQL access to the Virtuoso server respectively; and port 22 for SSH access which is allowed by default.

5. The successful deployment page is displayed

6. Clicking on the EC2 Console enables the new instance deployed to be seen in the EC2 Management Console.

7. Once the instance is in the the Running state the deployment is complete and the instance can be accessed.

Administering Virtuoso Instance via SSH

1. Make a ssh connection to the VM using the public key ( pem-file ) and username ( ubuntu by default) chosen when creating the deployment, and the Public IP address from the previous section as follows:

    ssh -i {pem-file} ubuntu@{Public IP address}

2. Once connected it is strongly recommended to update the VM to get the latest operating system and Virtuoso updates with the command:

    sudo apt-get upgrade

3. The following commands can be used to Administer the Virtuoso server:

• Start the Virtuoso Server:

    sudo service virtuoso start

• Stop the Virtuoso Server:

   sudo service virtuoso stop

• Restart the Virtuoso Server:

    sudo service virtuoso restart

• Check status of Virtuoso Server:

    sudo service virtuoso status

4. Check the Virtuoso server is automatically started post deployment with the command:

    sudo service virtuoso status

5. Determine the random password set for the dba user with the command:

    sudo cat /opt/virtuoso/database/.initial-password

6. A SQL connection can then be made Virtuoso with the isql command line tool with the command on port 1111 :

    isql 1111

7. Typical output for running these steps are:

$ scp -i certificates/virtuoso virtuoso.lic ubuntu@54.221.25.206:~/
$ ssh -i certificates/virtuoso.pem ubuntu@54.221.25.206
The authenticity of host '54.221.25.206 (54.221.25.206)' can't be established.
ECDSA key fingerprint is SHA256:QGsOFcQoa4x5DBavtdHWDQUUQtBdHJ/OkizKep8UOcM.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added '54.221.25.206' (ECDSA) to the list of known hosts.
Welcome to Ubuntu 18.04.5 LTS (GNU/Linux 5.4.0-1025-aws x86_64)

 * Documentation:  https://help.ubuntu.com
 * Management:     https://landscape.canonical.com
 * Support:        https://ubuntu.com/advantage

  System information as of Fri Jan 29 12:41:03 UTC 2021

  System load:  0.0                Processes:           104
  Usage of /:   2.0% of 116.27GB   Users logged in:     0
  Memory usage: 4%                 IP address for eth0: 10.0.0.214
  Swap usage:   0%


 * Canonical Livepatch is available for installation.
   - Reduce system reboots and improve kernel security. Activate at:
     https://ubuntu.com/livepatch

9 packages can be updated.
0 updates are security updates.


Last login: Tue Sep 22 19:26:19 2020 from 108.26.205.225
ubuntu@ip-10-0-0-214:~$ cd /opt/virtuoso/database
ubuntu@ip-10-0-0-214:/opt/virtuoso/database$ sudo bash
root@ip-10-0-0-214:/opt/virtuoso/database# cat .initial-password 
i-0343ad51fe5e4f196
root@ip-10-0-0-214:/opt/virtuoso/database# service virtuoso start
root@ip-10-0-0-214:/opt/virtuoso/database# service virtuoso status
● virtuoso.service - OpenLink Virtuoso Database
   Loaded: loaded (/lib/systemd/system/virtuoso.service; enabled; vendor preset: enabled)
   Active: active (running) since Fri 2021-01-29 12:04:31 UTC; 38min ago
  Process: 878 ExecStart=/opt/virtuoso/bin/virtuoso-start.sh $VIRTUOSO_DB_NAMES (code=exited, status=0/SUC
 Main PID: 1170 (virtuoso)
    Tasks: 15 (limit: 4915)
   CGroup: /system.slice/virtuoso.service
           └─1170 ./virtuoso

Jan 29 12:04:25 ip-10-0-0-214 systemd[1]: Starting OpenLink Virtuoso Database...
Jan 29 12:04:26 ip-10-0-0-214 virtuoso-start.sh[878]: Starting Virtuoso instance in [database]
Jan 29 12:04:26 ip-10-0-0-214 virtuoso-start.sh[878]:   - Starting the database
Jan 29 12:04:31 ip-10-0-0-214 systemd[1]: Started OpenLink Virtuoso Database.
root@ip-10-0-0-214:/opt/virtuoso/database# /opt/virtuoso/bin/isql 1111
OpenLink Virtuoso Interactive SQL (Virtuoso)
Version 08.03.3319 as of Sep  1 2020
Type HELP; for help and EXIT; to exit.

*** Error 08004: VD [Virtuoso Server]LI100: Number of licensed connections exceeded
at line 0 of Top-Level:

root@ip-10-0-0-214:/opt/virtuoso/database# service virtuoso stop
root@ip-10-0-0-214:/opt/virtuoso/database# service virtuoso start
root@ip-10-0-0-214:/opt/virtuoso/database# /opt/virtuoso/bin/isql 1111
OpenLink Virtuoso Interactive SQL (Virtuoso)
Version 08.03.3319 as of Sep  1 2020
Type HELP; for help and EXIT; to exit.

Enter password for dba :
Connected to OpenLink Virtuoso
Driver: 08.03.3319 OpenLink Virtuoso ODBC Driver
SQL> status('');
REPORT
VARCHAR
_______________________________________________________________________________

OpenLink Virtuoso VDB Server
Version 08.03.3319-pthreads for Linux as of Sep  1 2020 
Started on: 2021-01-29 12:45 GMT+0
CPU: 0.05% RSS: 148MB PF: 0
 
Database Status:
  File size 67108864, 8192 pages, 5733 free.
  20000 buffers, 1115 used, 85 dirty 0 wired down, repl age 0 0 w. io 0 w/crsr.
  Disk Usage: 1074 reads avg 0 msec, 0% r 0% w last  23 s, 138 writes flush          0 MB/s,
    34 read ahead, batch = 17.  Autocompact 0 in 0 out, 0% saved.
Gate:  166 2nd in reads, 0 gate write waits, 0 in while read 0 busy scrap. 
Log = virtuoso.trx, 8325 bytes
VDB: 0 exec 0 fetch 0 transact 0 error
2309 pages have been changed since last backup (in checkpoint state)
Current backup timestamp: 0x0000-0x00-0x00
Last backup date: unknown
Clients: 1 connects, max 1 concurrent
RPC: 6 calls, 1 pending, 1 max until now, 0 queued, 0 burst reads (0%), 0 second 0M large, 10M max
Checkpoint Remap 38 pages, 0 mapped back. 0 s atomic time.
    DB master 8192 total 5733 free 38 remap 1 mapped back
   temp  256 total 251 free
 
Lock Status: 0 deadlocks of which 0 2r1w, 0 waits,
   Currently 1 threads running 0 threads waiting 0 threads in vdb.

24 Rows. -- 2 msec.
SQL> 

Accessing the Virtuoso Instance via HTTP

1. The Virtuoso http server can be access on http://{Public IP Address}:8890 :

2. Click on the Conductor link in the left frame to access the Virtuoso Conductor Admin UI.

3. Use the Virtuoso dba username and password determined in Step 7 of the previous section to login to the Conductor

Performance Tuning

There are a range of AWS VM instance types with different system memory and CPU combinations. Collectively, the factors above affect the performance of your Virtuoso instance. Thus, use AWS VM Instance Type with sufficient memory and CPU cores for best performance for the specific use case.

Note: This VM is configured to use minimal system memory. For the instance type chosen, the NumberOfBuffer and MaxDirtyBuffers parameters in the /opt/virtuoso/database/virtuoso.ini configuration file should be increased to match the available memory, as detailed in the Virtuoso Performance Tuning Guide, for example –

VM Instance Type	System RAM	Number Of Buffers	Max Dirty Buffers
m5.large	8 GB	680000	500000
m5.xlarge	16 GB	1360000	1000000
m5.2xlarge	32 GB	2720000	2000000
m5.4xlarge	64 GB	5450000	4000000

– and the Virtuoso server restarted as detailed above.

Extrapolate the NumberOfBuffer and MaxDirtyBuffers parameters accordingly for different sized VMs.

Troubleshooting

If the Virtuoso server fails to start:

• Run the command sudo service virtuoso status to see if the Virtuoso server is running
• Check the /opt/virtuoso/database/virtuoso.log file to see why the server might have failed to start
• Ensure there file /opt/virtuoso/database/virtuoso.lck does not exist before starting the server
• Attempt to start the Virtuoso server with the command sudo service virtuoso start
• Run the command sudo service virtuoso status again to see if the Virtuoso server is running
• If it is now running attempt a connect via the SQL or HTTP interfaces are detailed above

Related

• Amazon OpenLink Virtuoso RedHat Linux 7.x BYOL AWS AMI
• Virtuoso Home Page
• Virtuoso Weblog
• OpenLink Software Home Page
• OpenLink Software Community Forum
• Twitter Page
• LinkedIn Page