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Chapter 1. Planning custom undercloud features
Before you configure and install director on the undercloud, you can plan to include custom features in your undercloud.
1.1. Character encoding configuration
Red Hat OpenStack Platform has special character encoding requirements as part of the locale settings:
-
Use UTF-8 encoding on all nodes. Ensure the
LANGenvironment variable is set toen_US.UTF-8on all nodes. - Avoid using non-ASCII characters if you use Red Hat Ansible Tower to automate the creation of Red Hat OpenStack Platform resources.
1.2. Considerations when running the undercloud with a proxy
Compared to using Red Hat Satellite for registry and package management, there are limitations when you run the undercloud with a proxy. If your environment uses a proxy, review these methods for integrating parts of Red Hat OpenStack Platform (RHOSP) with a proxy and the limitations of each method.
System-wide proxy configuration
Use this method to configure proxy communication for all network traffic on the undercloud. To configure the proxy settings, edit the /etc/environment file and set the following environment variables:
- http_proxy
- The proxy that you want to use for standard HTTP requests.
- https_proxy
- The proxy that you want to use for HTTPs requests.
- no_proxy
- A comma-separated list of domains that you want to exclude from proxy communications.
The system-wide proxy method has the following limitations:
-
The maximum length of
no_proxyis 1,024 characters due to a fixed size buffer in thepam_envpluggable authentication module (PAM). -
Some existing containers bind and parse the environment variables in
/etc/environmentfiles incorrectly, which causes issues when running these services. For information about updating the proxy settings in/etc/environmentfiles to work correctly for existing containers, see the Red Hat Knowledgebase solutions at https://access.redhat.com/solutions/7109135 and https://access.redhat.com/solutions/7007114.
dnf proxy configuration
Use this method to configure dnf to run all traffic through a proxy. To configure the proxy settings, edit the /etc/dnf/dnf.conf file and set the following parameters:
- proxy
- The URL of the proxy server.
- proxy_username
- The username that you want to use to connect to the proxy server.
- proxy_password
- The password that you want to use to connect to the proxy server.
- proxy_auth_method
- The authentication method used by the proxy server.
For more information about these options, run man dnf.conf.
The dnf proxy method has the following limitations:
-
This method provides proxy support only for
dnf. -
The
dnfproxy method does not include an option to exclude certain hosts from proxy communication.
Red Hat Subscription Manager proxy
Use this method to configure Red Hat Subscription Manager to run all traffic through a proxy. To configure the proxy settings, edit the /etc/rhsm/rhsm.conf file and set the following parameters:
- proxy_hostname
- Host for the proxy.
- proxy_scheme
- The scheme for the proxy when writing out the proxy to repo definitions.
- proxy_port
- The port for the proxy.
- proxy_username
- The username that you want to use to connect to the proxy server.
- proxy_password
- The password to use for connecting to the proxy server.
- no_proxy
- A comma-separated list of hostname suffixes for specific hosts that you want to exclude from proxy communication.
For more information about these options, run man rhsm.conf.
The Red Hat Subscription Manager proxy method has the following limitations:
- This method provides proxy support only for Red Hat Subscription Manager.
- The values for the Red Hat Subscription Manager proxy configuration override any values set for the system-wide environment variables.
Transparent proxy
If your network uses a transparent proxy to manage application layer traffic, you do not need to configure the undercloud itself to interact with the proxy because proxy management occurs automatically. A transparent proxy can help overcome limitations associated with client-based proxy configuration in RHOSP.
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