This adds a new cluster command: ipfs-cluster-follow.
This command allows initializing and running follower peers as configured by a
remote-source configuration. The command can list configured peers
and obtain information for each of them.
Peers are launched with the rest API listening on a local unix socket. The
command can be run to list the items in the cluster pinset using this
endpoint. Alternatively, if no socket is present, the peer will be assumed to
be offline and the pin list will be directly read from the datastore.
Cluster peers launched with this command (and their configurations) are
compatible with ipfs-cluster-ctl and ipfs-cluster-service. We purposely do not
support most configuration options here. Using ipfs-cluster-ctl or launching
the peers using ipfs-cluster-service is always an option when the usecase
deviates from that supported by ipfs-cluster-follow.
Examples:
$ ipfs-cluster-follow -> list configured peers
$ ipfs-cluster-follow --help
$ ipfs-cluster-follow <clusterName> init <url>
$ ipfs-cluster-follow <clusterName> info
$ ipfs-cluster-follow <clusterName> run
$ ipfs-cluster-follow <clusterName> list
On using `/debug/pprof` as index endpoint, profiles contained by it
would point to wrong url. For example, link for `allocs` would be
`/debug/allocs` (results in 404), whereas it should actually be
`/debug/pprof/allocs`.
Use a trailing slash to get correct links. `/debug/pprof` will
automatically be redirected to `/debug/pprof/`
This commit uses the Cluster.Peername to make the Jaeger
service name unique. This allows for inter-cluster traces
to show the relationship between the different peers in the
cluster. This commit also adds the Cluster.ID as a process
(global) tag on all spans produced by a peer. This is so
that a peer is uniquely identifiable, even when a more
human-friendly name has been used for the Cluster.Peername.
License: MIT
Signed-off-by: Adrian Lanzafame <adrianlanzafame92@gmail.com>
This commit adds support for OpenCensus tracing
and metrics collection. This required support for
context.Context propogation throughout the cluster
codebase, and in particular, the ipfscluster component
interfaces.
The tracing propogates across RPC and HTTP boundaries.
The current default tracing backend is Jaeger.
The metrics currently exports the metrics exposed by
the opencensus http plugin as well as the pprof metrics
to a prometheus endpoint for scraping.
The current default metrics backend is Prometheus.
Metrics are currently exposed by default due to low
overhead, can be turned off if desired, whereas tracing
is off by default as it has a much higher performance
overhead, though the extent of the performance hit can be
adjusted with smaller sampling rates.
License: MIT
Signed-off-by: Adrian Lanzafame <adrianlanzafame92@gmail.com>
