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+# Z3 deployment requirements
+
+Zebra + Zaino + Zallet discussion on configuration, secret handling and deployment
+
+
+Credits: Yass, Nuttycom, Daira-Emma, Str4d, NachoGeo, Gustavo
+
+_Note:_ This document is a recollection from a conversation had by the Z3 developers.
+
+## Assumptions
+
+Zallet is the most _user-facing_ part of Z3. Wise words from ECC Core Dev @nuttycom:
+
+> A really important thing to remember is that some, perhaps many of the people who
+> end up running Zallet *will not be sysadmins*. They will be ordinary people with
+> computers, potentially _quite security-unconscious_ ordinary people with computers.
+
+## Requirements
+
+- Z3 should be configurable at startup.
+- Configuration parameters could be secrets or sensitive information
+- Z3 configuration MUST be able to be trusted with _secrets_. 
+- Such configuration should not be available to other processes running on the host
+  that are not part of Z3.
+- Z3's main goal is to support Zallet (otherwise it would be Z2 😅).
+- Zallet is inherently stateful while Zebra and Zaino could (in theory) be deployed
+  in a stateless fashion via (very periodical) snapshots
+- Zallet does NOT require parellelism.
+- Zebra, Zaino - those have state that is expensive to recover, so parallelism makes
+  sense for them.
+- Z3 configuration should be friendly to failover schemes for environments with high-
+  availability needs.
+- "Wallets are absolutely mission-critical!". (Nuttycom)
+- Containerized approach does not force users to rebuild. It's bad DX/UX. (Gustavo)
+
+## Non-requirements
+- Establishing a one-fits-all solution. Scaling considerations differ at a Z-level. For
+example: Zaino clients may benefit from horizontal scaling solutions whereas Zallet
+users would be troubled by having seemingly duplicated instances of a wallet
+(anti-pattern / footgun). In between that spectrum, there is no gain for Zebra users
+to have one or more Zebra instances in terms of performance.
+
+## Config via environment variables
+
+*Definition*: available configuration parameters are defined on documented environment
+variables which are picked up by the process or processes involved in Z3. 
+
+### Advantages
+- Integration with CI environments
+- Follows good practices of Kubernetes (k8s) and containerized environments
+- Does not require volumes to be mounted
+- Favorable for stateless setups (not exactly this case)
+
+### Disadvantages
+- Poses security concerns for non-containerized environments
+- OpSec skills needed to harden secrets from other processes running on the same
+machine
+- Not favorable for stateful setups (mostly this case)
+- Hardening options like `hidpid=2` depend on system administrators and are not
+imposable by Zallet.
+
+## Config via on-disk file
+*Definition*: available configuration parameters defined in the documentation are
+set through a configuration file that is available on disk to the process or
+processes involved in Z3.
+
+### Advantages:
+- File benefit from OS's user permission system which is a higher barrier to
+unauthorized access.
+- Encryption is handled easier.
+- non-volatile, more suitable for stateful environments.
+
+### Disadvantages:
+- Requires more manual processes in terms of CI and OpSec
+- can be an overkill for some type of configuration values that might change
+between invocations (ie: verbosity) 
+
+## Possible consensus on configuration methods decision:
+
+### Create two builds of Zallet (Nuttycom's Edition)
+There will be two distinct builds of Zallet for distribution purposes:
+- The Default Build
+  - MUST receive all of its configurable values through a config file
+  - Can be run on container (provided that a config file is mounted to it)
+- Container-only Build:
+  - Specifically intended for containerization
+  - Only distributed as prebuilt Docker Images
+  - Configurable via Environment Variables
+  - uses some sort of `unstable-docker-only` feature flag to compile this flavor
+  of build.
+#### Testing Requirements:
+- CI Should test both flows
+  - This would require running regtest Zebra and Zaino instances in the stack
+- Minimum Setup:
+ - test compiling with and without environment variables
+
+### Mixed Approach (Yasser's Edition)
+Instead of two distinct kind of builds, only maintain a single kind of build where
+configuration is categorized in "non-sensitive" and "sensitive". The former are
+convenience, easy-overridable environment variables. The latter are values of
+secretive or business critical nature such as API keys, private keys, passwords, etc.
+
+The values deemed non-sensitive will be allowed to be set via environment variables.
+The sensitive ones will be required via configuration files.
+
+This works for both containerized builds and normal builds.
+
+> In Kubernetes, as I mentioned earlier, this can still be handled cleanly using
+> ConfigMaps for sensitive configuration and mounting secrets as tmpfs volumes.
+
+This approach minimizes the risk of accidental exposure while keeping deployments flexible.