systemd ignores a CPUQuota= or MemoryMax= it can't parse ("Invalid ...,
ignoring") and runs the unit without that limit. A swarm cap replaces
the hive's answer, so such a value left the agent uncapped while the
route, GET and the dashboard all said it was capped. argus on #4268 (R3)
found values the route took that systemd ignores: 12.345%, 400.123%,
0.001%, 17000000T, 99999999999999999999T and 99999999999999999999%.
The validators now accept a subset of what systemd parses, measured
against `systemd-analyze verify` (systemd 260):
- a percentage takes at most two decimals and is above zero, up to 100%
for memory_max and 21474836.47% for cpu_quota (systemd keeps the quota
in hundredths of a percent in a C int, not a u64)
- a size is one parse_size term: digits, an optional fraction, then
nothing, B, K, M, G or T, case-sensitive. The whole part and the
fraction digits fit u64, the whole part (plus one with a fraction)
fits u64 once scaled, and the byte count is at least 1 and below
2^64 - 1, as systemd checks them.
P and E, which systemd reads, stay refused because hive-c0re's validator
refuses them, and one value the hive refuses stops every cap update on
that hive. Values are stored as given: lower-case suffixes and a B
after a multiplier are refused rather than normalized, as systemd
refuses them.
The newline-injection values from the hive's test are in both bad lists
and go through the router in a_cap_with_a_second_line_is_a_400_and_the_caps_stay.
GET reads through a new agent_limits::open that returns None for a
missing bucket, answered as {}, instead of creating the bucket.
An agent's CPU and memory caps, set from the swarm. Keyed by the agent
alone, in a new `agent-limits` KV bucket that swarm-controller alone
writes, the same shape as `agent-inference` (#5034): mara on #4268,
"agents are not tied to a hive. dont tie the limits to the hive."
PUT {"cpu_quota": "400%", "memory_max": "8G"} every field optional,
replaces the stored value
GET the stored caps, {} when there are none
DELETE 204
PUT refuses an agent no hive's wanted state declares (as the inference
route does), unknown fields (422), zero and anything systemd does not take,
before the queue is asked, and stores memory in the spelling systemd takes
(8gb -> 8G). The hive hands these values to systemd verbatim.
The routes sit under /api/, behind the swarm UI vhost's authelia
subrequest like every sibling; the core-toggle module-eval case pins that
gate.
The bucket's reader on the hive comes in the next commit.
Contributes to #3865.
