How to use the CentOS Plus kernel for CentOS 7 on Xen VPS

RedHat has dropped the ball on supporting the Xen based virtualisation technologies and due to commercial reasons will not fix their recently introduced kernel bug on Xen PV platforms.

So the fix is to switch to the “CentOS Plus” kernel, which has been updated by the CentOS Team to correct the issue introduced by RedHat.

The way to do this is:

a) Boot your CentOS 7 Xen based VPS onto an older kernel that still works (not in the 611 version stream)

b) Change your /etc/yum.repos.d/CentOS-Base.repo file to be:

[centosplus]
name=CentOS-$releasever - Plus
mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=centosplus&infra=$infra
#baseurl=http://mirror.centos.org/centos/$releasever/centosplus/$basearch/
gpgcheck=1
enabled=1
includepkgs=kernel-plus
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7

c) Edit your /etc/sysconfig/kernel file to list:

DEFAULTKERNEL=kernel-plus
(instead of DEFAULTKERNEL=kernel )

d) Run “yum install kernel-plus” as root.

e) Reboot on the CentOS Plus kernel, which should be the new default kernel in your Grub.

FYI,
Richard.

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Data Centre, Network & POP Maintenance Notice – Wed evening & Thu morning, Oct 4th/5th 2017

During the evening of Wednesday, October 4th from 9pm that night (through to 6am on Thursday morning) we will be performing upgrades to selected hosting server platforms and network components 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, October 4th 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 (and 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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Data Centre, Network & POP Maintenance Notice – Wed evening & Thu morning, Aug 9th/10th 2017

During the evening of Wednesday, August 9th 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, August 9th 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 (and 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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Install Odoo 10 on CentOS 7

The following commands run as the root user logged into a CentOS 7 (RHEL 7) based host will install the pre-req’s of Odoo 10 (latest nightly build) and then Odoo 10 itself.

Install and activate the EPEL Repository

yum install epel-release

Install, configure and start PostgreSQL DB Server

yum install -y postgresql-server
postgresql-setup initdb
systemctl enable postgresql
systemctl start postgresql

Install and activate the Odoo 10 Nightly Repository

yum install yum-utils
yum-config-manager --add-repo=https://nightly.odoo.com/10.0/nightly/rpm/odoo.repo

Install Odoo 10 itself

yum -y install odoo

After the first start of Odoo, you can configure your Admin Password in the /etc/odoo/openerp-server.conf file:

admin_passwd = PASSWORDTEXT

Restart Odoo after configuring the admin password:

systemctl restart odoo

This will deliver the basic and initial Odoo Install available on the local server.

FYI and regards,
Richard.

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New 10Gbps Internet Link coming online for Network Presence in Sydney

For the last few weeks we’ve been testing and proving a new 10Gbps fiber based link for us in the Equinix SY1 Data Centre in Mascot, Sydney.

These tests & trialing have all gone well and this new 10Gpbs link will come online soon for most customers.

This new fiber optic link in Sydney has better and lower latency Internet hops and routers to both the domestic and International Internet than we’ve had before and locally (domestic Internet access) this includes direct Sydney (and all capital cities) hand-off to Telstra’s network, so we’re now very “close” to Telstra ISP & mobile network end-users nationwide!

Customers will be using this link more and more over the coming weeks and months and it’ll have a redundant path coming online for this same 10Gbps uplink later in 2017.

Regards,
Richard.

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Data Centre, Network & POP Maintenance Notice – Wed evening & Thu morning, June 14/15th 2017

During the evening of Wednesday, June 14th 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, June 14th 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 (and 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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Data Centre, Network & POP Maintenance Notice – Friday evening & Saturday morning, April 21st/22nd 2017

During the evening of Friday, April 21st from 9pm that night (through to 6am on Saturday 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 Friday, April 21st 2017 through to 6am on the Saturday 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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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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