Technical Blog
How you could connect to PPTP server from linux to access your office network?
This post will show you how to set up a TLS/SSL certificate from Let’s Encrypt on an Ubuntu server running Apache as a web server.
SSL stands for Secure Socket Layer. SSL is a protocol used for sending confidential data over the Internet. SSL creates a secure connection between a web browser and the server. In this process, SSL uses encryption to keep the data private.
• Encrypts Information. SSL certificate ensures the data you send online are read by only the intended recipient and none else.
• SSL makes some changes in the original data so that the data can’t be read by the third parties.
• Having SSL certificate ensures authentication.
• Secure against phishing attacks.
• Better search engine rankings.
• Ubuntu server with a non-root sudo user.
• The Apache web server installed and domain name properly configured.
• Your domain mapped with server IP.
The first step to Let’s Encrypt SSL certificate is to install the certbot software on your server.
sudo add-apt-repository ppa:certbot/certbot
You will need to press ENTER to accept. Then update the package list using following command
sudo apt-get update
Install Certbot SSL using following command.
sudo apt-get install python-certbot-apache
Following command is automatically install a new SSL certificate on apache server that is valid for only 3 months. A single certificate that is valid for multiple domains or subdomains. Execute following command.
sudo certbot --apache -d example.com
If you can execute above command then it will ask some basic information like email, agree terms & service and enabling both http and https access. After install certificate, automatically changed apache configuration file as required.
When the installation is finished, you should be able to find the generated certificate files at /etc/letsencrypt/live.
Let’s Encrypt’s certificates is valid for 3 months. Following command is to check for expiring certificates and renew them automatically.
sudo crontab -e
After execute above command, Your text editor will open the default crontab which is a text file with some help text in it.
Paste in the following line at the end of the file, then save and close it:
15 3 * * * /usr/bin/certbot renew --quiet
Now your domain is ready with SSL Certificate.
Zimbra email collaboration is the leading open source enterprise email solution and the most preferred alternative to Microsoft Exchange. It is now available in hosted, cloud and on-premise versions. Zimbra provides an excellent browser-based interface that allows users to integrate with mail clients easily. Silent Infotech provides consultation, implementation and migration services with support for your Zimbra email/collaboration solution.
Download zimbra based on your platform, from latest release Zimbra Open Source. Here we will choose Ubuntu 16.04 LTS 64-bit release and download it with wget. Get the download address location and download form machine where you want to install zimbra
root@silent:/cd /home/
root@silent:/home# wget https://files.zimbra.com/downloads/8.7.7_GA/zcs-8.7.7_GA_1787.UBUNTU16_64.20170410133400.tgz
root@silent:/home# tar tar xzf zcs-8.7.7_GA_1787.UBUNTU16_64.20170410133400.tgz
root@zimbra8:~# vim /etc/network/interfaces
If you have dhcp line:
allow-hotplug eth0
iface eth0 inet dhcp
Then change it to static Ethernet configuration:
allow-hotplug eth0
iface eth0 inet static
address 10.X.X.X
netmask 255.255.255.0
gateway 10.X.X.X
dns-nameservers 127.0.0.1
dns-nameservers 8.8.8.8
Note, address : Zimbra machine ip,
gateway : router IP address in your Environment.
DNS Server, type your own Zimbra server if you will use an internal DNS server on Zimbra Server, or other IP in case you have a valid DNS Server already exist.
root@silent:/home# vi /etc/hosts
127.0.0.1 localhost
10.10.2.101 mail.silent.com mail
root@silent:/home# reboot
root@silent:/home# cd zcs-8.7.7_GA_1787.UBUNTU16_64.20170410133400/
root@silent:/home/zcs-8.7.7_GA_1787.UBUNTU16_64.20170410133400# ./install.sh
Now follow given steps to complete the installation:
...
...
License Terms for the Zimbra Collaboration Suite:
http://www.zimbra.com/license/zimbra-public-eula-2-5.html
Do you agree with the terms of the software license agreement? [N] y
Operations logged to /tmp/install.log.zlP8ruf3
Checking for existing installation...
zimbra-ldap...NOT FOUND
zimbra-logger...NOT FOUND
zimbra-mta...NOT FOUND
zimbra-dnscache...NOT FOUND
zimbra-snmp...NOT FOUND
zimbra-store...NOT FOUND
zimbra-apache...NOT FOUND
zimbra-spell...NOT FOUND
zimbra-convertd...NOT FOUND
zimbra-memcached...NOT FOUND
zimbra-proxy...NOT FOUND
zimbra-archiving...NOT FOUND
zimbra-core...NOT FOUND
PLEASE READ THIS AGREEMENT CAREFULLY BEFORE USING THE SOFTWARE.
ZIMBRA, INC. ("ZIMBRA") WILL ONLY LICENSE THIS SOFTWARE TO YOU IF YOU
FIRST ACCEPT THE TERMS OF THIS AGREEMENT. BY DOWNLOADING OR INSTALLING
THE SOFTWARE, OR USING THE PRODUCT, YOU ARE CONSENTING TO BE BOUND BY
THIS AGREEMENT. IF YOU DO NOT AGREE TO ALL OF THE TERMS OF THIS
AGREEMENT, THEN DO NOT DOWNLOAD, INSTALL OR USE THE PRODUCT.
License Terms for the Zimbra Collaboration Suite:
http://www.zimbra.com/license/zimbra-public-eula-2-5.html
Do you agree with the terms of the software license agreement? [N] y
To install Zimbra Collaboration on a single server, enter Y for the ldap, logger, mta, snmp, store, and spell packages.The installer verifies that there is enough room to install Zimbra Collaboration. If there is not, the installation stops.
Checking for installable packages
Found zimbra-core
Found zimbra-ldap
Found zimbra-logger
Found zimbra-mta
Found zimbra-dnscache
Found zimbra-snmp
Found zimbra-store
Found zimbra-apache
Found zimbra-spell
Found zimbra-memcached
Found zimbra-proxy
Use Zimbra's package repository [Y]
Select the packages to install
Install zimbra-ldap [Y] y
Install zimbra-logger [Y] y
Install zimbra-mta [Y] y
Install zimbra-dnscache [Y] y
Install zimbra-snmp [Y] y
Install zimbra-store [Y] y
.
.
Checking required space for zimbra-core
Checking space for zimbra-store
Checking required packages for zimbra-store
zimbra-store package check complete.
Installing:
zimbra-core
zimbra-ldap
zimbra-logger
zimbra-mta
zimbra-dnscache
zimbra-snmp
zimbra-store
.
.
The system will be modified.
Continue? [N] y
Removing /opt/zimbra
Removing zimbra crontab entry...done.
Cleaning up zimbra init scripts...done.
Cleaning up /etc/security/limits.conf...done.
Finished removing Zimbra Collaboration Server.
Installing packages
Local packages zimbra-core zimbra-ldap zimbra-logger zimbra-mta zimbra-snmp zimbra-store zimbra-apache zimbra-spell zimbra-proxy selected for installation
Monitor /tmp/install.log.sKlWbSLr for package installation progress
Remote package installation started
Installing zimbra-core-components zimbra-ldap-components zimbra-mta-components zimbra-snmp-components zimbra-store-components zimbra-apache-components zimbra-spell-components zimbra-memcached zimbra-proxy-components....
Local package installation started
Installing zimbra-core zimbra-ldap zimbra-logger zimbra-mta zimbra-snmp zimbra-store zimbra-apache zimbra-spell zimbra-proxy...done
Operations logged to /tmp/zmsetup.20160430-185719.log
Installing LDAP configuration database...done.
Setting defaults...
…
If it throws exception about a missing MX record as given below, which says your domain DNS records are not matching with zimbra server’s expectation, based on the hostname which is configured earlier. Find your /etc/hostname file and check DNS records to resolve the problem.
DNS ERROR resolving MX for mail.silent.com
It is suggested that the domain name has an MX record configured in DNS
Change domain name? [Yes]
Create domain: [mail.silent.com] example.com
MX: mail.silent.com (10.10.2.101)
Interface: 192.168.1.252
Interface: fd7a:4c04:5f10:0:20c:29ff:feb9:ecf8
Interface: 127.0.0.1
Interface: ::1
done.
Checking for port conflicts
Main menu
1) Common Configuration:
2) zimbra-ldap: Enabled
3) zimbra-logger: Enabled
4) zimbra-mta: Enabled
5) zimbra-dnscache: Enabled
6) zimbra-snmp: Enabled
7) zimbra-store: Enabled
+Create Admin User: yes
+Admin user to create: admin@mail.silent.com
******* +Admin Password UNSET
...
...
...
To change default admin password, select menu 7 and then inside zimbra store select 4, provide password and press enter
Type r to return to the Main menu.
Select from menu, or press ‘a’ to apply config (? – help) a
Save configuration data to a file? [Yes] : press enter
Save config in file: [/opt/zimbra/config.10687]:press enter
…
…
Notify Zimbra of your installation? [Yes]
Notifying Zimbra of installation via http://www.zimbra.com/cgi-bin/notify.cgi?VER=8.7.7_GA_1787.UBUNTU16_64&MAIL=admin@mail.silent.com
Notification complete
Setting up zimbra crontab…done.
Moving /tmp/zmsetup.20160430-185719.log to /opt/zimbra/log
Configuration complete – press return to exit
To check admin control panel: http://mail.silent.com:7071
To check user login: http://mail.silent.com
Suggestions & inquiry are welcome http://silentinfotech.com/get
Some times if your production server goes down due to power failure you might face below error while accessing “Connection Tracking Reports” in Radius manager.
Follow below mentioned steps to resolve issue.
Go to database folder
cd /var/lib/mysql/conntrack service mysql stop myisamchk -r -v -f 2017\@002d06\@002d04.MYI service mysql start
# don’t forgot to change table name
Go to database folder
cd /var/lib/mysql/conntrack service mysqld stop myisamchk -r -v -f 2017\@002d06\@002d04.MYI service mysqld start
# don’t forgot to change table name
Zimbra email collaboration has more than 400 million trusted users worldwide. It is the leading open source enterprise email solution and the most preferred alternative to Microsoft Exchange. It is now available in hosted, cloud and on-premise versions. Zimbra provides an excellent browser-based interface that allows users to integrate with mail clients easily.
Silent Infotech provides consultation, implementation and migration services with support for your Zimbra email/collaboration solution.
Join us to know more.
Installing Ubuntu after Windows is easy and strait forward process. But to install Windows after Ubuntu is a bit tricky and not recommended. But you still have to do it sometimes.
So, here are the steps to install Windows 10 when you have Ubuntu 16.04 already installed. And you want to run both together.
sudo add-apt-repository ppa:yannubuntu/boot-repair && sudo apt-get update
sudo apt-get install -y boot-repair && boot-repair
PayFort is the Most Trusted Online Payment Gateway in the Middle East because of the local currency support and local technical support. They have clients from various industries and who are industry leaders in Middle East like Souq.com and Carrefour UAE.
Silent Infotech provides highly integrated Payfort payment gateway module leveraging Odoo’s architectural modularity. This type of integration allows the Merchant’s Customer to check-out on the Merchant’s payment page without being redirected to external sites and thus enjoy the seamless User experience.
For more info & enquiry contact us @ contact@silentinfotech.com
Door eye is smartly designed home security appliance which acts upon the door bell ring provides the owner with the real-time photo capture of the person ringing the door bell.
It works as simple as when someone rings your doorbell, your smart-phone blurts and buzzes, and with a tap, you can view the captured snap of the visitor. It doesn’t matter if you’re in the kitchen, at the office.
At Silent Infotech we have successfully deployed odoo cluster using rancher platform in order to mange the huge number of users and good amount of concurrent user load.
What is Rancher?
Rancher is designed to solve all of the critical challenges necessary to run all of your applications in containers. Rancher provides a full set of infrastructure services for containers, including networking, storage services, host management, load balancing and more. All of these services work across any infrastructure, and make it simple to reliably deploy and manage applications.
What is docker?
Docker containers wrap up a piece of software in a complete File System that contains everything it needs to run: code, runtime, system tools, system libraries – anything you can install on a server. This guarantees that it will always run the same, regardless of the environment it is running in.
Odoo Cluster Architecture
Odoo cluster has been setup using below set of containers/docker instances
A secure and open unified collaboration solution.
Security
Mobility
Extensibility
Scalability