Accessing Internet from cloud VM when you have only private network enabled
We have a couple of virtual servers hosted with Softlayer
for processing data and backup purpose. The public interface is
completely turned off i.e. no Internet access. We can only access VMs
using a VPN. It resulted in decreased costs and many security problems
for backend servers. However, when you order “Private Network Only”
cloud VM, you cannot route outgoing traffic to the Internet using your
VM.
This is how we order the server for our company: Fig.01: Private only network at Softlayer cloud. No direct outgoing or incoming access from the Internet
You can’t access the Internet or download or upload files to the internet.
acl SSL_ports port 443
acl Safe_ports port 80 # http
acl Safe_ports port 21 # ftp
acl Safe_ports port 443 # https
acl Safe_ports port 70 # gopher
acl Safe_ports port 210 # wais
acl Safe_ports port 1025-65535 # unregistered ports
acl Safe_ports port 280 # http-mgmt
acl Safe_ports port 488 # gss-http
acl Safe_ports port 591 # filemaker
acl Safe_ports port 777 # multiling http
acl CONNECT method CONNECT
http_access deny !Safe_ports
http_access deny CONNECT !SSL_ports
http_access allow localhost manager
http_access deny manager
## private vm ##
acl zfsbackup src 10.81.33.4
http_access allow zfsbackup
http_access allow localhost
http_access deny all
## this server with eth0 connected to VLAN ##
http_port 10.86.115.100:3128
cache_dir ufs /var/spool/squid 100 16 256
coredump_dir /var/spool/squid
refresh_pattern ^ftp: 1440 20% 10080
refresh_pattern ^gopher: 1440 0% 1440
refresh_pattern -i (/cgi-bin/|?) 0 0% 0
refresh_pattern (Release|Packages(.gz)*)$ 0 20% 2880
refresh_pattern . 0 20% 4320
## this server with eth1 connected to the Internt ##
tcp_outgoing_address 75.zzz.xxx.yyy
forwarded_for delete
via off
forwarded_for off
follow_x_forwarded_for deny all
request_header_access X-Forwarded-For deny all
cache_mem 1024 MB
Now, all you have to do is setup http_proxy variables on private VM to download files from the internet or git repos:
# set http_proxy, do not forget to set ftp_proxy, https_proxy, socks_proxy etc
export http_proxy="http://10.86.115.100:3128"
export HTTP_PROXY="http://10.86.115.100:3128"
# Now we have access to the internet ##
wget http://some-url/file.foo.gz
curl -I google.com
lynx google.com
# special case
git config --global http.proxy $http_proxy
git commands here
# Use proxy sever with user and password
export http_proxy=http://USERNAME:[email protected]:3128"
wget ..
curl ..
Make sure you read man pages of commands that need http_proxy access.
Don’t forget to add http_proxy in your shell startup file i.e.
~/.bash_profile.
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