Monitoring & Tuning Linux Network Stack for Sending Data

An excellent foray into the depths of the Linux Networking Stack and s/ware at https://blog.packagecloud.io/eng/2017/02/06/monitoring-tuning-linux-networking-stack-sending-data/

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Data Centre, Network & POP Maintenance Notice – Wed evening & Thu morning, February 22nd/23rd 2017

During the evening of Wednesday, February 22nd from 9pm that night (through to 6am on Thursday morning) we will be performing upgrades to selected hosting server platforms of Network Presence in Sydney, Australia.

Customers with services (VPS) on the hosting platforms to be upgraded may be emailed advisory notices shortly, and this is a general notice related to other ancillary upgrades and Infrastructure Maintenance being performed during this scheduled window of time.

This Maintenance Window starts from 9pm Sydney time on the evening of Wednesday, February 22nd 2017 through to 6am on the Thursday morning, and I’ll be personally contactable by phone & online during and after these works in-case there’s any issues that arise. During this Maintenance Window, selected network or server equipment will be worked on, upgraded and restarted. Works will be completed as quickly as possible (where possible, timing information will be in emails to affected customers) and restarts are short service interruptions only, while upgrades may incur longer service interruptions.

This will incur outages to selected hosting services of Network Presence in Australia during this off-peak scheduled works period.
In addition, there may be some impact (short 5-10 minute periods) to the general Internet Connectivity of portions of Network Presence in Sydney during these works, though redundant routing will be utilised during these works.

Progress updates during the works will be posted to our Operations Twitter Feed at https://twitter.com/netpresops

FYI and regards,
Richard.

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Generating Multi-Domain SSL CSR and Key files

A compound SSL Certificate product available from some Registrars currently is the “Multi-Domain” Certificate, for up to 3 x domains by default, with more available from there.

To generate the required Key and CSR files to obtain those multi-domain Certificates, OpenSSL command lines like the following can be used:

openssl req -new -newkey rsa:2048 -sha256 -nodes -keyout FILENAME.key -out FILENAME.csr -subj '/C=XX/ST=STATE/L=LOCATION/O=ORGANISATION/OU=ORGUNIT/CN=FIRSTDOMAINNAME/emailAddress=EMAIL@ADDRESS/subjectAltName=DNS.1=SECONDDOMAIN,DNS.2=THIRDDOMAIN'

Additional domains can be added by appending more “,DNS.X=NEXTDOMAINNAME” (where X is from 3 onwards) in the subjectAltName parameter.

For more OpenSSL operations, see our older OpenSSL post.

FYI,
Richard.

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Apache Tomcat/TomEE Administration Training Course for 3 days from Monday April 3rd 2017

We’ve confirmed the date for the next Tomcat Administration Training Course that I present via Network Presence here in Adelaide during the week starting April 3rd.

Both Tomcat 7 and 8 the latest TomEE will be covered, with many course segments noting differences and changes between Tomcat 6, 7 & 8.

This course will be run at the first-rate Training Rooms of Express Training Connections in Gawler Place, Adelaide CBD and if you’re interested, please contact Sue at ETC on by email to info@etc-australia.com or phone 08 82324502 (Intl. +61 8 8232 4502)

This is an intensive and highly-technical (requires Linux or Windows System Admin capabilities) hands-on training course run over 3 days, with generous lunch & teas included by ETC. Each student has their own dedicated classroom desktop server, with virtualised local and cloud-based servers for trials, tutorials, testing, and there’s Internet accessible ‘Production’ servers for each student. Both Linux and Windows local and cloud-hosted servers are available to course participants, so if you prefer to work in Windows based systems for your Tomcat Training, then that’s fine.

The broad topics covered in the course are:

+ Tomcat Architecture, including installation and clustering
+ Tomcat Software Components
+ Comparison and Online Discovery of Difference between Tomcat, TomEE, Glassfish, JBoss, Geronimo and WebSphere
+ Trouble Shooting and Admin features
+ Performance and Tuning of both Tomcat & TomEE
+ Common and example Tomcat Web Applications, incl. Liferay, CAS, Hippo, OpenCMS, Enonic, Alfresco, dotCMS and other ‘bundled’ Tomcat systems/distributions.

There’s Tutorial, Trial sessions and an open workflow of subject presentation with multimedia support (electronic course notes supplied), then guided demonstrations and more to give deep understanding and some experience in technical details of Tomcat operations.

As per above, please contact Sue at ETC on by email to info@etc-australia.com or phone 08 82324502 if you have any interest or follow-up queries on this course being presented in early April 2017 in Adelaide, South Australia.

FYI and regards,
Richard.

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Value SSD VPS Plans

Released in January 2017 our Value SSD VPS Plans provide fantastic Sydney/Australia based VPS resources and pricing.

See https://www.networkpresence.com.au/hosting/vps-plans/value-ssd-vps.html for these VPS Plans.

Regards,
Richard.

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Installing Fail2Ban on CentOS 7

Fail2Ban is an important utility on the modern Internet for stopping “port probe” and other repeat intrusion/login attempts on your Internet services. The following describes how to install and initially configure it to monitor & block repeated login failures on the SSH service.

It isn’t in the standard CentOS 7 Repositories, but is easily installed and configured with the following commands and settings done as the root user:

a) The Fail2Ban package is in the EPEL-Release repository which is activated with the command:

yum install epel-release

b) After the above which makes the EPEL Release Repository available for use, Fail2Ban is installed with:

yum install fail2ban
(type ‘y’ to confirm the EPEL Key etc)

c) Fail2Ban is activated on the system with the command:

systemctl enable fail2ban

A quick SSH based default config for fail2ban is achieved by loading the following lines to the newly created file /etc/fail2ban/jail.local

[DEFAULT]
# Ban hosts for one hour:
bantime = 3600

# Override /etc/fail2ban/jail.d/00-firewalld.conf:
banaction = iptables-multiport

[sshd]
enabled = true

The above configured Fail2Ban to block repeat offenders for 1 hour, to use the IPTables Firewalling capabilities on the SSH port of 22.

After loading the above to the jail.local file, restart the fail2ban service with:

systemctl restart fail2ban

You can check on fail2ban’s operations with the command:

fail2ban-client status

FYI,
Richard.

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Looking forward to AMD’s new Zen CPUs. “AMD’s Zen…

Looking forward to AMD’s new Zen CPUs. “AMD’s Zen SR7 8 core flagship CPU… & outperform Intel’s 8 core i7 596wccftech.com/amd-zen-8-core…EYkV

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Epic Games presents a free course “Getting Started…

Epic Games presents a free course “Getting Started in Virtual Reality with Unreal Engine” in Adelaide soon. eventbrite.com/e/getting-star…

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Data Centre, Network & POP Maintenance Notice – Wed & Thu evenings, December 7th/8th 2016

During the evenings of Wednesday and Thursday, December 7th and 8th, from 10pm each night (through to 6 am on the next morning) we will be performing upgrades to selected hosting server platforms of Network Presence in Sydney, Australia.

Customers with services (VPS) on the hosting platforms to be upgraded may be emailed advisory notices shortly, and this is a general notice related to other ancillary upgrades and Infrastructure Maintenance being performed during this scheduled window of time.

This Maintenance Window starts from 10pm Sydney time on the evenings of Wednesday and Thursday, December 7th & 8th 2016 through to 6am on the following morning each day, and I’ll be personally contactable by phone & online during and after these works in-case there’s any issues that arise. During this Maintenance Window, selected network or server equipment will be worked on, upgraded and restarted. Works will be completed as quickly as possible (where possible, timing information will be in emails to affected customers) and restarts are short service interruptions only, while upgrades may incur longer service interruptions.

This will incur outages to selected hosting services of Network Presence in Australia during this off-peak scheduled works period.
In addition, there may be some impact (short 5-10 minute periods) to the general Internet Connectivity of portions of Network Presence in Sydney during these works, though redundant routing will be utilised during these works.

Progress updates during the works will be posted to our Operations Twitter Feed at https://twitter.com/netpresops

FYI and regards,
Richard.

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RT @ozbargain: netpres: 30% off Network Presence V…

RT @ozbargain: netpres: 30% off Network Presence Value VPS Plans ozb.me/ogb

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