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  #1  
Old 03-06-2012, 03:13 PM
infinitnet infinitnet is offline
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Location: /etc/sysconfig
Posts: 468
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CentOS 5 x64 Tuning & Hardening Script

What this script does, is disabling unneeded services, such as bluetooth, portmap, cups and much more. After that, it applies optimized kernel settings to improve security and performance of your CentOS system. Optional settings are to set Google's public DNS resolvers as default and to change your SSH port. Both are optional, but nevertheless they're recommended. This version is compiled for 64bit RHEL5 based systems, such as CentOS 5.x x64.

Installation:
Code:
wget http://www.r00t-services.net/scripts/rhel5-tuning-v1.3
chmod +x rhel5-tuning-v1.3
./rhel5-tuning-v1.3
<<snipped>>

Last edited by anon-e-mouse; 04-11-2012 at 12:15 AM.
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  #2  
Old 03-14-2012, 06:51 PM
jcarney1987 jcarney1987 is offline
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Join Date: Jul 2008
Location: Seminole, OK
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Well being a binary how do we know we can trust it. Has anybody Sandboxed it yet?

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  #3  
Old 03-14-2012, 07:11 PM
PCS-Chris PCS-Chris is offline
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This is all pretty standard stuff.. I doubt there is any super secret tricks in there, why encrypt a free script?

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  #4  
Old 03-15-2012, 11:01 PM
BiggyMike BiggyMike is offline
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I don't trust encrypted scripts... I'll use open source scripts...

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  #5  
Old 03-16-2012, 08:13 AM
infinitnet infinitnet is offline
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Join Date: Dec 2011
Location: /etc/sysconfig
Posts: 468
Meh, here you go WHT. Of course it's no very advanced stuff, but many users don't tweak their kernel settings at all, etc. I'm using it for fresh servers mostly.

Code:
#!/bin/bash

#####################################################
#                                                   #
# Script: RHEL5 Tuning Script                       #
# Version: 1.3                                      #
# Author: r00t-Services.net                         #
#                                                   #
#  ### Changelog ###                                #
#                                                   #
# v1.3 - 2012-03-06                                 #
# - Software RAID enabled                           #
# - Output silenced                                 #
# - "[OK]" feedback added                           #
# - NFS enabled                                     #
# - MySQL Security commented out                    #
# - Many kernel parameters optimized                #
# - Some 'net.ipv6' settings added                  #
#                                                   #
# v1.2 - 2011-09-28                                 #
# - Initial questions added                         #
# - MySQL security added                            #
# - SSH security added                              #
# - Google nameservers added                        #
# - 'net.ipv4.tcp_tw_recycle' removed               #
#                                                   #
# v1.1 - 2011-09-27                                 #
# - Kernel hardening added                          #
# - Stop services before disabling                  #
# - Service 'mdmonitor' enabled by default          #
#                                                   #
#####################################################


# Initial questions
echo -n "
Welcome to RHEL5 Tuning Script v1.3!
Are you sure want to continue? [y/n]: "
read answer1
if [ $answer1 = "y" -o $answer1 = "Y" ]; then
	:
elif [ $answer1 = "n" -o $answer1 = "N" ]; then
	exit 0
else
	echo "Error: Valid options are y and n."
	exit 1
fi

# Stop and disable unneeded services
service acpid stop > /dev/null 2>&1
service portmap stop > /dev/null 2>&1
service cpuspeed stop > /dev/null 2>&1
service apmd stop > /dev/null 2>&1
service autofs stop > /dev/null 2>&1
service bluetooth stop > /dev/null 2>&1
service hidd stop > /dev/null 2>&1
service firstboot stop > /dev/null 2>&1
service cups stop > /dev/null 2>&1
service gpm stop > /dev/null 2>&1
service hplip stop > /dev/null 2>&1
service isdn stop > /dev/null 2>&1
service kudzu stop > /dev/null 2>&1
service kdump stop > /dev/null 2>&1
service mcstrans stop > /dev/null 2>&1
service pcscd stop > /dev/null 2>&1
service readahead_early stop > /dev/null 2>&1
service readahead_later stop > /dev/null 2>&1
service setroubleshoot stop > /dev/null 2>&1
service rhnsd stop > /dev/null 2>&1
service xfs stop > /dev/null 2>&1
service yum-updatesd stop > /dev/null 2>&1
service avahi-daemon stop > /dev/null 2>&1
chkconfig acpid off > /dev/null 2>&1
chkconfig portmap off > /dev/null 2>&1
chkconfig cpuspeed off > /dev/null 2>&1
chkconfig apmd off > /dev/null 2>&1
chkconfig autofs off > /dev/null 2>&1
chkconfig bluetooth off > /dev/null 2>&1
chkconfig hidd off > /dev/null 2>&1
chkconfig firstboot off > /dev/null 2>&1
chkconfig cups off > /dev/null 2>&1
chkconfig gpm off > /dev/null 2>&1
chkconfig hplip off > /dev/null 2>&1
chkconfig isdn off > /dev/null 2>&1
chkconfig kudzu off > /dev/null 2>&1
chkconfig kdump off > /dev/null 2>&1
chkconfig mcstrans off > /dev/null 2>&1
chkconfig pcscd off > /dev/null 2>&1
chkconfig readahead_early off > /dev/null 2>&1
chkconfig readahead_later off > /dev/null 2>&1
chkconfig setroubleshoot off > /dev/null 2>&1
chkconfig rhnsd off > /dev/null 2>&1
chkconfig xfs off > /dev/null 2>&1
chkconfig yum-updatesd off > /dev/null 2>&1
chkconfig avahi-daemon off > /dev/null 2>&1
echo -e "
Disabling unneeded services... ""[""\e[1;32mOK\e[0m""]"

# Erase unneeded services
yum -y remove anacron setroubleshoot > /dev/null 2>&1
echo -e "Uninstalling unneeded services... ""[""\e[1;32mOK\e[0m""]"

# Harden kernel, apply settings, restart NIC
cp /etc/sysctl.conf /etc/sysctl.conf-bak > /dev/null 2>&1
echo "######################################
#                                    #
#   Kernel Hardening & Tuning v1.3   #
#        by r00t-Services.net        #
#                                    #
######################################

kernel.printk = 4 4 1 7
kernel.panic = 10
kernel.sysrq = 0
kernel.shmmax = 4294967296
kernel.shmall = 3774873
kernel.msgmni = 2048
kernel.core_uses_pid = 1
kernel.msgmnb = 65536
kernel.msgmax = 65536
vm.swappiness = 30
vm.vfs_cache_pressure = 50
fs.file-max = 359208
net.core.rmem_default = 256960
net.core.rmem_max = 4194304
net.core.wmem_default = 256960
net.core.wmem_max = 4194304
net.core.optmem_max = 57344
net.core.netdev_max_backlog = 3000
net.core.somaxconn = 3000
net.ipv4.route.flush = 1
net.ipv4.conf.all.bootp_relay = 0
net.ipv4.icmp_ratelimit = 20
net.ipv4.icmp_ratemask = 88089
net.ipv4.ipfrag_high_thresh = 512000
net.ipv4.ipfrag_low_thresh = 446464
net.ipv4.tcp_wmem = 4096 87380 4194304
net.ipv4.tcp_rmem = 4096 87380 4194304
net.ipv4.tcp_mem = 512000 1048576 4194304
net.ipv4.tcp_max_tw_buckets = 1440000
net.ipv4.ip_conntrack_max = 1048576
net.ipv4.netfilter.ip_conntrack_max = 1048576
net.ipv4.ip_forward = 1
net.ipv4.conf.all.send_redirects = 0
net.ipv4.conf.default.send_redirects = 1
net.ipv4.conf.default.forwarding = 1
net.ipv4.conf.all.forwarding = 0
net.ipv4.conf.all.accept_source_route = 0
net.ipv4.conf.all.accept_redirects = 0
net.ipv4.conf.all.secure_redirects = 1
net.ipv4.conf.all.shared_media = 1
net.ipv4.conf.all.log_martians = 1
net.ipv4.conf.default.accept_source_route = 0
net.ipv4.conf.default.accept_redirects = 0
net.ipv4.conf.default.secure_redirects = 1
net.ipv4.conf.default.log_martians = 1
net.ipv4.icmp_echo_ignore_broadcasts = 1
net.ipv4.icmp_ignore_bogus_error_responses = 1
net.ipv4.tcp_window_scaling = 0
net.ipv4.tcp_rfc1337 = 1
net.ipv4.tcp_syncookies = 1
net.ipv4.tcp_synack_retries = 2
net.ipv4.tcp_syn_retries = 2
net.ipv4.tcp_max_syn_backlog = 2048
net.ipv4.conf.all.rp_filter = 1
net.ipv4.conf.default.rp_filter = 1
net.ipv4.conf.default.proxy_arp = 0
net.ipv4.tcp_timestamps = 0
net.ipv4.tcp_sack = 0
net.ipv4.tcp_ecn = 0
net.ipv4.tcp_fin_timeout = 20
net.ipv4.tcp_keepalive_intvl = 15
net.ipv4.tcp_keepalive_probes = 5
net.ipv4.tcp_no_metrics_save = 1
net.ipv6.conf.all.accept_redirects = 0
net.ipv6.conf.default.accept_redirects = 0
net.ipv6.conf.all.secure_redirects = 1
net.ipv6.conf.default.secure_redirects = 1" > /etc/sysctl.conf
sysctl -p > /dev/null 2>&1
echo -e "Tuning and hardening kernel... ""[""\e[1;32mOK\e[0m""]"

# Google NS
echo -n "
Do you want to use Google's recursive DNS resolvers? [y/n]: "
read ns
if [ $ns = "y" -o $ns = "Y" ]; then
	cp /etc/resolv.conf /etc/resolv.conf-bak
	echo "nameserver 8.8.8.8
nameserver 8.8.4.4" > /etc/resolv.conf
	service network restart > /dev/null 2>&1
	echo -e "
Changing resolvers to Google DNS... ""[""\e[1;32mOK\e[0m""]"
elif [ $ns = "n" -o $ns = "N" ]; then
	:
else
	echo "Error: Valid options are y and n."
	exit 1
fi


# MySQL security
#if grep "bind-address" /etc/my.cnf; then
#	:
#elif [ -f /etc/my.cnf ]; then
#	cp /etc/my.cnf /etc/my.cnf-bak
#	echo "bind-address=127.0.0.1" >> /etc/my.cnf
#	service mysqld restart
#else
#	echo "
#MySQL not found."
#fi

# SSH security and finish
echo -n "
Do you want to change your SSH port? [y/n]: "
read answer2
if [ $answer2 = "y" -o $answer2 = "Y" ]; then
	echo -n "
Enter your new SSH port [1024-49151 recommended]: "
	read sshport
	sed -i-bak "s/Port [0-9]*/Port $sshport/g" /etc/ssh/sshd_config > /dev/null 2>&1
	sed -i-bak2 "s/#Port [0-9]*/Port $sshport/g" /etc/ssh/sshd_config > /dev/null 2>&1
	echo -e "
Changing SSH Port... ""[""\e[1;32mOK\e[0m""]"
	echo "
Your server has been tuned and secured by r00t-Services.net!
System reboot recommended.
Please write down your new SSH port: $sshport
It will be active if you do:

service sshd restart
"
elif [ $answer2 = "n" -o $answer2 = "N" ]; then
	echo "
Your server has been tuned and secured by r00t-Services.net!
System reboot recommended.
"
	exit 0
else
	echo "Error: Valid options are y and n."
	exit 1
fi
exit 0

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  #6  
Old 08-25-2012, 09:23 AM
briangriffin briangriffin is offline
Junior Guru Wannabe
  
Join Date: May 2012
Posts: 45
Is there a 32 bit version of this script / does anyone know of a script that will optimize (low memory VPS) and harden CentOS 5.x 32bit?

Thanks,

Steve

Quote:
Originally Posted by infinitnet View Post
Meh, here you go WHT. Of course it's no very advanced stuff, but many users don't tweak their kernel settings at all, etc. I'm using it for fresh servers mostly.

Code:
#!/bin/bash

#####################################################
#                                                   #
# Script: RHEL5 Tuning Script                       #
# Version: 1.3                                      #
# Author: r00t-Services.net                         #
#                                                   #
#  ### Changelog ###                                #
#                                                   #
# v1.3 - 2012-03-06                                 #
# - Software RAID enabled                           #
# - Output silenced                                 #
# - "[OK]" feedback added                           #
# - NFS enabled                                     #
# - MySQL Security commented out                    #
# - Many kernel parameters optimized                #
# - Some 'net.ipv6' settings added                  #
#                                                   #
# v1.2 - 2011-09-28                                 #
# - Initial questions added                         #
# - MySQL security added                            #
# - SSH security added                              #
# - Google nameservers added                        #
# - 'net.ipv4.tcp_tw_recycle' removed               #
#                                                   #
# v1.1 - 2011-09-27                                 #
# - Kernel hardening added                          #
# - Stop services before disabling                  #
# - Service 'mdmonitor' enabled by default          #
#                                                   #
#####################################################


# Initial questions
echo -n "
Welcome to RHEL5 Tuning Script v1.3!
Are you sure want to continue? [y/n]: "
read answer1
if [ $answer1 = "y" -o $answer1 = "Y" ]; then
	:
elif [ $answer1 = "n" -o $answer1 = "N" ]; then
	exit 0
else
	echo "Error: Valid options are y and n."
	exit 1
fi

# Stop and disable unneeded services
service acpid stop > /dev/null 2>&1
service portmap stop > /dev/null 2>&1
service cpuspeed stop > /dev/null 2>&1
service apmd stop > /dev/null 2>&1
service autofs stop > /dev/null 2>&1
service bluetooth stop > /dev/null 2>&1
service hidd stop > /dev/null 2>&1
service firstboot stop > /dev/null 2>&1
service cups stop > /dev/null 2>&1
service gpm stop > /dev/null 2>&1
service hplip stop > /dev/null 2>&1
service isdn stop > /dev/null 2>&1
service kudzu stop > /dev/null 2>&1
service kdump stop > /dev/null 2>&1
service mcstrans stop > /dev/null 2>&1
service pcscd stop > /dev/null 2>&1
service readahead_early stop > /dev/null 2>&1
service readahead_later stop > /dev/null 2>&1
service setroubleshoot stop > /dev/null 2>&1
service rhnsd stop > /dev/null 2>&1
service xfs stop > /dev/null 2>&1
service yum-updatesd stop > /dev/null 2>&1
service avahi-daemon stop > /dev/null 2>&1
chkconfig acpid off > /dev/null 2>&1
chkconfig portmap off > /dev/null 2>&1
chkconfig cpuspeed off > /dev/null 2>&1
chkconfig apmd off > /dev/null 2>&1
chkconfig autofs off > /dev/null 2>&1
chkconfig bluetooth off > /dev/null 2>&1
chkconfig hidd off > /dev/null 2>&1
chkconfig firstboot off > /dev/null 2>&1
chkconfig cups off > /dev/null 2>&1
chkconfig gpm off > /dev/null 2>&1
chkconfig hplip off > /dev/null 2>&1
chkconfig isdn off > /dev/null 2>&1
chkconfig kudzu off > /dev/null 2>&1
chkconfig kdump off > /dev/null 2>&1
chkconfig mcstrans off > /dev/null 2>&1
chkconfig pcscd off > /dev/null 2>&1
chkconfig readahead_early off > /dev/null 2>&1
chkconfig readahead_later off > /dev/null 2>&1
chkconfig setroubleshoot off > /dev/null 2>&1
chkconfig rhnsd off > /dev/null 2>&1
chkconfig xfs off > /dev/null 2>&1
chkconfig yum-updatesd off > /dev/null 2>&1
chkconfig avahi-daemon off > /dev/null 2>&1
echo -e "
Disabling unneeded services... ""[""\e[1;32mOK\e[0m""]"

# Erase unneeded services
yum -y remove anacron setroubleshoot > /dev/null 2>&1
echo -e "Uninstalling unneeded services... ""[""\e[1;32mOK\e[0m""]"

# Harden kernel, apply settings, restart NIC
cp /etc/sysctl.conf /etc/sysctl.conf-bak > /dev/null 2>&1
echo "######################################
#                                    #
#   Kernel Hardening & Tuning v1.3   #
#        by r00t-Services.net        #
#                                    #
######################################

kernel.printk = 4 4 1 7
kernel.panic = 10
kernel.sysrq = 0
kernel.shmmax = 4294967296
kernel.shmall = 3774873
kernel.msgmni = 2048
kernel.core_uses_pid = 1
kernel.msgmnb = 65536
kernel.msgmax = 65536
vm.swappiness = 30
vm.vfs_cache_pressure = 50
fs.file-max = 359208
net.core.rmem_default = 256960
net.core.rmem_max = 4194304
net.core.wmem_default = 256960
net.core.wmem_max = 4194304
net.core.optmem_max = 57344
net.core.netdev_max_backlog = 3000
net.core.somaxconn = 3000
net.ipv4.route.flush = 1
net.ipv4.conf.all.bootp_relay = 0
net.ipv4.icmp_ratelimit = 20
net.ipv4.icmp_ratemask = 88089
net.ipv4.ipfrag_high_thresh = 512000
net.ipv4.ipfrag_low_thresh = 446464
net.ipv4.tcp_wmem = 4096 87380 4194304
net.ipv4.tcp_rmem = 4096 87380 4194304
net.ipv4.tcp_mem = 512000 1048576 4194304
net.ipv4.tcp_max_tw_buckets = 1440000
net.ipv4.ip_conntrack_max = 1048576
net.ipv4.netfilter.ip_conntrack_max = 1048576
net.ipv4.ip_forward = 1
net.ipv4.conf.all.send_redirects = 0
net.ipv4.conf.default.send_redirects = 1
net.ipv4.conf.default.forwarding = 1
net.ipv4.conf.all.forwarding = 0
net.ipv4.conf.all.accept_source_route = 0
net.ipv4.conf.all.accept_redirects = 0
net.ipv4.conf.all.secure_redirects = 1
net.ipv4.conf.all.shared_media = 1
net.ipv4.conf.all.log_martians = 1
net.ipv4.conf.default.accept_source_route = 0
net.ipv4.conf.default.accept_redirects = 0
net.ipv4.conf.default.secure_redirects = 1
net.ipv4.conf.default.log_martians = 1
net.ipv4.icmp_echo_ignore_broadcasts = 1
net.ipv4.icmp_ignore_bogus_error_responses = 1
net.ipv4.tcp_window_scaling = 0
net.ipv4.tcp_rfc1337 = 1
net.ipv4.tcp_syncookies = 1
net.ipv4.tcp_synack_retries = 2
net.ipv4.tcp_syn_retries = 2
net.ipv4.tcp_max_syn_backlog = 2048
net.ipv4.conf.all.rp_filter = 1
net.ipv4.conf.default.rp_filter = 1
net.ipv4.conf.default.proxy_arp = 0
net.ipv4.tcp_timestamps = 0
net.ipv4.tcp_sack = 0
net.ipv4.tcp_ecn = 0
net.ipv4.tcp_fin_timeout = 20
net.ipv4.tcp_keepalive_intvl = 15
net.ipv4.tcp_keepalive_probes = 5
net.ipv4.tcp_no_metrics_save = 1
net.ipv6.conf.all.accept_redirects = 0
net.ipv6.conf.default.accept_redirects = 0
net.ipv6.conf.all.secure_redirects = 1
net.ipv6.conf.default.secure_redirects = 1" > /etc/sysctl.conf
sysctl -p > /dev/null 2>&1
echo -e "Tuning and hardening kernel... ""[""\e[1;32mOK\e[0m""]"

# Google NS
echo -n "
Do you want to use Google's recursive DNS resolvers? [y/n]: "
read ns
if [ $ns = "y" -o $ns = "Y" ]; then
	cp /etc/resolv.conf /etc/resolv.conf-bak
	echo "nameserver 8.8.8.8
nameserver 8.8.4.4" > /etc/resolv.conf
	service network restart > /dev/null 2>&1
	echo -e "
Changing resolvers to Google DNS... ""[""\e[1;32mOK\e[0m""]"
elif [ $ns = "n" -o $ns = "N" ]; then
	:
else
	echo "Error: Valid options are y and n."
	exit 1
fi


# MySQL security
#if grep "bind-address" /etc/my.cnf; then
#	:
#elif [ -f /etc/my.cnf ]; then
#	cp /etc/my.cnf /etc/my.cnf-bak
#	echo "bind-address=127.0.0.1" >> /etc/my.cnf
#	service mysqld restart
#else
#	echo "
#MySQL not found."
#fi

# SSH security and finish
echo -n "
Do you want to change your SSH port? [y/n]: "
read answer2
if [ $answer2 = "y" -o $answer2 = "Y" ]; then
	echo -n "
Enter your new SSH port [1024-49151 recommended]: "
	read sshport
	sed -i-bak "s/Port [0-9]*/Port $sshport/g" /etc/ssh/sshd_config > /dev/null 2>&1
	sed -i-bak2 "s/#Port [0-9]*/Port $sshport/g" /etc/ssh/sshd_config > /dev/null 2>&1
	echo -e "
Changing SSH Port... ""[""\e[1;32mOK\e[0m""]"
	echo "
Your server has been tuned and secured by r00t-Services.net!
System reboot recommended.
Please write down your new SSH port: $sshport
It will be active if you do:

service sshd restart
"
elif [ $answer2 = "n" -o $answer2 = "N" ]; then
	echo "
Your server has been tuned and secured by r00t-Services.net!
System reboot recommended.
"
	exit 0
else
	echo "Error: Valid options are y and n."
	exit 1
fi
exit 0

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  #7  
Old 08-25-2012, 09:25 AM
infinitnet infinitnet is offline
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Join Date: Dec 2011
Location: /etc/sysconfig
Posts: 468
It works on 32bit too.

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  #8  
Old 08-25-2012, 09:26 AM
Steven Steven is offline
I like ice cream
  
Join Date: Mar 2003
Location: California USA
Posts: 11,788
Quote:
net.ipv4.tcp_window_scaling = 0
I don't know why people set this...

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  #9  
Old 08-25-2012, 09:31 AM
briangriffin briangriffin is offline
Junior Guru Wannabe
  
Join Date: May 2012
Posts: 45
Thanks @infinitnet.

Steve

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  #10  
Old 08-25-2012, 09:48 AM
infinitnet infinitnet is offline
Web Hosting Evangelist
  
Join Date: Dec 2011
Location: /etc/sysconfig
Posts: 468
Quote:
Originally Posted by Steven View Post
I don't know why people set this...
Well, because this way single TCP sockets can't use too many resources, which is useful for highly utilized servers (network wise) or for example in case of TCP floods. Of course that may vary, depending on what the server is being used for - this script is not some kind of magic that makes every server perfect for every purpose. It's more like a basic optimization, which works well for "most systems".

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Parallels SVP Automation Oleg Melnikov Joins Runa Capital as Part-Time CTO

Stream Data Centers Achieves LEED Gold Certification for Dallas Facility

Liquid Web Updates Mobile Management Interface with Bill Payment Feature

Rackspace Integrates Mailgun into Cloud Control Panel

Cloudian Releases Connector for Citrix CloudPortal Business Manager 2.0

ControlCircle Partners with Skyscape on Managed Cloud Service for Public UK Organizations

ViaWest to Open 150,000 Square Foot Minneapolis Data Center in Q1 2014

Tenzing Managed IT Services Expands to US with Dallas Data Center

Latisys Launches Disaster Recovery as a Service Offering

Amazon Web Services to Open Virginia Office, Meets FedRAMP Compliance



 

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