Configure access and security for instances

updated: 2019-08-16 16:57

Configure access and security for instances

Configure access and security for instances¶

When working with images in the SDK, you will call novaclient methods.

Add a keypair¶

To generate a keypair, call the novaclient.v1_1.keypairs.KeypairManager.create method:

import novaclient.v1_1.client as nvclient
nova = nvclient.Client(...)
keypair_name = "staging"
keypair = nova.keypairs.create(name=keypair_name)
print keypair.private_key

The Python script output looks something like this:

You typically write the private key to a file to use it later. The file must be readable and writeable by only the file owner; otherwise, the SSH client will refuse to read the private key file. The safest way is to create the file with the appropriate permissions, as shown in the following example:

import novaclient.v1_1.client as nvclient
import os
nova = nvclient.Client(...)
keypair_name = "staging"
private_key_filename = "/home/alice/id-staging"
keypair = nova.keypairs.create(name=keypair_name)

# Create a file for writing that can only be read and written by
owner
fp = os.open(private_key_filename, os.O_WRONLY | os.O_CREAT, 0o600)
with os.fdopen(fp, 'w') as f:
    f.write(keypair.private_key)

Import a keypair¶

If you have already generated a keypair with the public key located at ~/.ssh/id_rsa.pub, pass the contents of the file to the novaclient.v1_1.keypairs.KeypairManager.create method to import the public key to Compute:

import novaclient.v1_1.client as nvclient
import os.path
with open(os.path.expanduser('~/.ssh/id_rsa.pub')) as f:
    public_key = f.read()
nova = nvclient.Client(...)
nova.keypairs.create('mykey', public_key)

List keypairs¶

To list keypairs, call the novaclient.v1_1.keypairs.KeypairManager.list method:

import novaclient.v1_1.client as nvclient
nova = nvclient.Client(...)
keypairs = nova.keypairs.list()

Create and manage security groups¶

To list security groups for the current project, call the novaclient.v_1.security_groups.SecurityGroupManager.list method:

import novaclient.v1_1.client as nvclient
nova = nvclient.Client(...)
security_groups = nova.security_groups.list()

To create a security group with a specified name and description, call the novaclient.v_1.security_groups.SecurityGroupManager.create method:

import novaclient.v1_1.client as nvclient
nova = nvclient.Client(...)
nova.security_groups.create(name="web", description="Web servers")

To delete a security group, call the novaclient.v_1.security_groups.SecurityGroupManager.delete method, passing either a novaclient.v1_1.security_groups.SecurityGroup object or group ID as an argument:

import novaclient.v1_1.client as nvclient
nova = nvclient.Client(...)
group = nova.security_groups.find(name="web")
nova.security_groups.delete(group)
# The following lines would also delete the group:
# nova.security_groups.delete(group.id)
# group.delete()

Create and manage security group rules¶

Access the security group rules from the rules attribute of a novaclient.v1_1.security_groups.SecurityGroup object:

import novaclient.v1_1.client as nvclient
nova = nvclient.Client(...)
group = nova.security_groups.find(name="web")
print group.rules

To add a rule to a security group, call the novaclient.v1_1.security_group_rules.SecurityGroupRuleManager.create method:

import novaclient.v1_1.client as nvclient
nova = nvclient.Client(...)
group = nova.security_groups.find(name="web")
# Add rules for ICMP, tcp/80 and tcp/443
nova.security_group_rules.create(group.id, ip_protocol="icmp",
                                 from_port=-1, to_port=-1)
nova.security_group_rules.create(group.id, ip_protocol="tcp",
                                 from_port=80, to_port=80)
nova.security_group_rules.create(group.id, ip_protocol="tcp",
                                 from_port=443, to_port=443)

updated: 2019-08-16 16:57

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