Scripts to download files from google storage based on sha1 sums

third_party/gsutil/boto/docs/source/security_groups.rst

+.. _security_groups:
+
+===================
+EC2 Security Groups
+===================
+
+Amazon defines a security group as:
+
+"A security group is a named collection of access rules.  These access rules
+ specify which ingress, i.e. incoming, network traffic should be delivered
+ to your instance."
+
+To get a listing of all currently defined security groups::
+
+    >>> rs = conn.get_all_security_groups()
+    >>> print rs
+    [SecurityGroup:appserver, SecurityGroup:default, SecurityGroup:vnc, SecurityGroup:webserver]
+
+Each security group can have an arbitrary number of rules which represent
+different network ports which are being enabled.  To find the rules for a
+particular security group, use the rules attribute::
+
+    >>> sg = rs[1]
+    >>> sg.name
+    u'default'
+    >>> sg.rules
+    [IPPermissions:tcp(0-65535),
+     IPPermissions:udp(0-65535),
+     IPPermissions:icmp(-1--1),
+     IPPermissions:tcp(22-22),
+     IPPermissions:tcp(80-80)]
+
+In addition to listing the available security groups you can also create
+a new security group.  I'll follow through the "Three Tier Web Service"
+example included in the EC2 Developer's Guide for an example of how to
+create security groups and add rules to them.
+
+First, let's create a group for our Apache web servers that allows HTTP
+access to the world::
+
+    >>> web = conn.create_security_group('apache', 'Our Apache Group')
+    >>> web
+    SecurityGroup:apache
+    >>> web.authorize('tcp', 80, 80, '0.0.0.0/0')
+    True
+
+The first argument is the ip protocol which can be one of; tcp, udp or icmp.
+The second argument is the FromPort or the beginning port in the range, the
+third argument is the ToPort or the ending port in the range and the last
+argument is the CIDR IP range to authorize access to.
+
+Next we create another group for the app servers::
+
+    >>> app = conn.create_security_group('appserver', 'The application tier')
+
+We then want to grant access between the web server group and the app
+server group.  So, rather than specifying an IP address as we did in the
+last example, this time we will specify another SecurityGroup object.:
+
+    >>> app.authorize(src_group=web)
+    True
+
+Now, to verify that the web group now has access to the app servers, we want to
+temporarily allow SSH access to the web servers from our computer.  Let's
+say that our IP address is 192.168.1.130 as it is in the EC2 Developer
+Guide.  To enable that access::
+
+    >>> web.authorize(ip_protocol='tcp', from_port=22, to_port=22, cidr_ip='192.168.1.130/32')
+    True
+
+Now that this access is authorized, we could ssh into an instance running in
+the web group and then try to telnet to specific ports on servers in the
+appserver group, as shown in the EC2 Developer's Guide.  When this testing is
+complete, we would want to revoke SSH access to the web server group, like this::
+
+    >>> web.rules
+    [IPPermissions:tcp(80-80),
+     IPPermissions:tcp(22-22)]
+    >>> web.revoke('tcp', 22, 22, cidr_ip='192.168.1.130/32')
+    True
+    >>> web.rules
+    [IPPermissions:tcp(80-80)]