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Local health endpoint #2488

Closed
joshuaspence opened this issue Nov 9, 2016 · 5 comments
Closed

Local health endpoint #2488

joshuaspence opened this issue Nov 9, 2016 · 5 comments
Labels
theme/health-checks Health Check functionality type/enhancement Proposed improvement or new feature
Milestone
Unplanned

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@joshuaspence
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I want to use Consul to provide healthchecks for Amazon ELBs. Basically, I wanted to set the ELB healthcheck to query an instance's health by hitting some Consul HTTP endpoint. The /v1/agent endpoint seems close to what I want, but there doesn't seem to be a /v1/agent/service/<service_id>/health endpoint. Does such an endpoint exist (maybe I am looking in the wrong place)?
@slackpad
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slackpad commented Nov 9, 2016

Hi @joshuaspence we don't currently have an agent-level endpoint to pull the health of an agent. There's https://www.consul.io/docs/agent/http/health.html#health_node but that'll end up going up to the Consul servers, and the HTTP status code doesn't indicate the state of the health checks. This looks like a possible dup of #1468.

@slackpad slackpad added type/enhancement Proposed improvement or new feature post-0.9 labels May 3, 2017
@slackpad slackpad added the theme/health-checks Health Check functionality label May 25, 2017
@brumschlag
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+1
How can I use consul with an ELB? I want to have the elb take out the instance if I put it in maintenance mode.

@joshuaspence
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Would the upstream be interested in a pull request for this functionality?

@kamaradclimber
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kamaradclimber commented Oct 6, 2017 •
edited
Loading

We would definitely be interested by having /v1/agent/service/<service id>/health return 200, 429 or 500.

That would allow to configure complex checks on consul side and expose a very simple interface for our loadbalancer (which would delegate healthchecks to consul).

@kamaradclimber kamaradclimber mentioned this issue Oct 7, 2017
Merged
kamaradclimber added a commit to criteo-forks/consul that referenced this issue Dec 5, 2017
@kamaradclimber
Implement /v1/agent/health/service/<service id> endpoint
a588e73 
This endpoint aggregate all checks related to <service id> on the agent
and return an appropriate http code + the string describing the worst
check.

This allows to cleanly expose service status to other component, hiding
complexity of multiple checks.
This is especially useful to use consul to feed a loadbalancer which
would deleguate healthchecking to consul agent.

Exposing this endpoint on the agent is necessary to avoid a hit on
consul servers and avoid decreasing resiliency (this endpoint will work
even if there is no consul leader in the cluster).

Fix hashicorp#2488, relates to hashicorp#802

Change-Id: Ib340c62bbbba46fd4256ed31474d8ffb1762d4df
Signed-off-by: Grégoire Seux <[email protected]>
@slackpad slackpad added this to the Unplanned milestone Jan 5, 2018
@slackpad slackpad removed the post-0.9 label Jan 5, 2018
fboismenu pushed a commit to criteo-forks/consul that referenced this issue Jan 23, 2018
@kamaradclimber
Implement /v1/agent/health/service/<service id> endpoint
2b281cf 
This endpoint aggregate all checks related to <service id> on the agent
and return an appropriate http code + the string describing the worst
check.

This allows to cleanly expose service status to other component, hiding
complexity of multiple checks.
This is especially useful to use consul to feed a loadbalancer which
would deleguate healthchecking to consul agent.

Exposing this endpoint on the agent is necessary to avoid a hit on
consul servers and avoid decreasing resiliency (this endpoint will work
even if there is no consul leader in the cluster).

Fix hashicorp#2488, relates to hashicorp#802

Change-Id: Ib340c62bbbba46fd4256ed31474d8ffb1762d4df
Signed-off-by: Grégoire Seux <[email protected]>
kamaradclimber added a commit to criteo-forks/consul that referenced this issue Jan 23, 2018
@kamaradclimber
Implement /v1/agent/health/service/<service id> endpoint
58e43ee 
This endpoint aggregate all checks related to <service id> on the agent
and return an appropriate http code + the string describing the worst
check.

This allows to cleanly expose service status to other component, hiding
complexity of multiple checks.
This is especially useful to use consul to feed a loadbalancer which
would deleguate healthchecking to consul agent.

Exposing this endpoint on the agent is necessary to avoid a hit on
consul servers and avoid decreasing resiliency (this endpoint will work
even if there is no consul leader in the cluster).

Fix hashicorp#2488, relates to hashicorp#802

Change-Id: Ib340c62bbbba46fd4256ed31474d8ffb1762d4df
Signed-off-by: Grégoire Seux <[email protected]>
fboismenu pushed a commit to criteo-forks/consul that referenced this issue Feb 15, 2018
@kamaradclimber
Implement /v1/agent/health/service/<service id> endpoint
bb85b0e 
This endpoint aggregate all checks related to <service id> on the agent
and return an appropriate http code + the string describing the worst
check.

This allows to cleanly expose service status to other component, hiding
complexity of multiple checks.
This is especially useful to use consul to feed a loadbalancer which
would deleguate healthchecking to consul agent.

Exposing this endpoint on the agent is necessary to avoid a hit on
consul servers and avoid decreasing resiliency (this endpoint will work
even if there is no consul leader in the cluster).

Fix hashicorp#2488, relates to hashicorp#802

Change-Id: Ib340c62bbbba46fd4256ed31474d8ffb1762d4df
Signed-off-by: Grégoire Seux <[email protected]>
@kadaan
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kadaan commented Feb 19, 2018 •
edited
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@joshuaspence
I wanted the same functionality, so I developed a sidecar that can be used to accomplish this: Consulate. The first version is done and I'm testing it in my dev environment this week. Would love any feedback!

ShimmerGlass pushed a commit to criteo-forks/consul that referenced this issue Nov 9, 2018
@kamaradclimber
Implement /v1/agent/health/service/<service id> endpoint
bd2ed98 
This endpoint aggregate all checks related to <service id> on the agent
and return an appropriate http code + the string describing the worst
check.

This allows to cleanly expose service status to other component, hiding
complexity of multiple checks.
This is especially useful to use consul to feed a loadbalancer which
would deleguate healthchecking to consul agent.

Exposing this endpoint on the agent is necessary to avoid a hit on
consul servers and avoid decreasing resiliency (this endpoint will work
even if there is no consul leader in the cluster).

Fix hashicorp#2488, relates to hashicorp#802

Change-Id: Ib340c62bbbba46fd4256ed31474d8ffb1762d4df
Signed-off-by: Grégoire Seux <[email protected]>
ShimmerGlass pushed a commit to criteo-forks/consul that referenced this issue Nov 9, 2018
@kamaradclimber
Implement /v1/agent/health/service/<service id> endpoint
56347f8 
This endpoint aggregate all checks related to <service id> on the agent
and return an appropriate http code + the string describing the worst
check.

This allows to cleanly expose service status to other component, hiding
complexity of multiple checks.
This is especially useful to use consul to feed a loadbalancer which
would deleguate healthchecking to consul agent.

Exposing this endpoint on the agent is necessary to avoid a hit on
consul servers and avoid decreasing resiliency (this endpoint will work
even if there is no consul leader in the cluster).

Fix hashicorp#2488, relates to hashicorp#802

Change-Id: Ib340c62bbbba46fd4256ed31474d8ffb1762d4df
Signed-off-by: Grégoire Seux <[email protected]>
ShimmerGlass pushed a commit to criteo-forks/consul that referenced this issue Dec 3, 2018
@kamaradclimber
Implement /v1/agent/health/service/<service id> endpoint
80b58fe 
This endpoint aggregate all checks related to <service id> on the agent
and return an appropriate http code + the string describing the worst
check.

This allows to cleanly expose service status to other component, hiding
complexity of multiple checks.
This is especially useful to use consul to feed a loadbalancer which
would deleguate healthchecking to consul agent.

Exposing this endpoint on the agent is necessary to avoid a hit on
consul servers and avoid decreasing resiliency (this endpoint will work
even if there is no consul leader in the cluster).

Fix hashicorp#2488, relates to hashicorp#802

Change-Id: Ib340c62bbbba46fd4256ed31474d8ffb1762d4df
Signed-off-by: Grégoire Seux <[email protected]>
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@brumschlag @joshuaspence @kamaradclimber @slackpad @kadaan