From a16ee5b62c814b3ff677676031fb30f213b35396 Mon Sep 17 00:00:00 2001 From: zim Date: Tue, 2 May 2023 19:54:03 +1200 Subject: [PATCH] basic metric exporter --- README.md | 5 +++ go.mod | 36 ++++++++++++++++++++ go.sum | 98 +++++++++++++++++++++++++++++++++++++++++++++++++++++++ main.go | 79 ++++++++++++++++++++++++++++++++++++++++++++ 4 files changed, 218 insertions(+) create mode 100644 README.md create mode 100644 go.mod create mode 100644 go.sum create mode 100644 main.go diff --git a/README.md b/README.md new file mode 100644 index 0000000..81dfc5e --- /dev/null +++ b/README.md @@ -0,0 +1,5 @@ +# Docker Stat Exporter + +This is a small, basic metrics exporter for prometheus that is set to answer the question "Are my docker containers writing logs"? + +It uses the official docker client for go to poll your docker daemon, get the logs for the last 12 hours, and count the # of entries per container. diff --git a/go.mod b/go.mod new file mode 100644 index 0000000..c11aea7 --- /dev/null +++ b/go.mod @@ -0,0 +1,36 @@ +module github.com/planetary-social/docker-stat-exporter + +go 1.20 + +require ( + github.com/docker/docker v23.0.5+incompatible + github.com/prometheus/client_golang v1.15.0 +) + +require ( + github.com/Microsoft/go-winio v0.6.1 // indirect + github.com/beorn7/perks v1.0.1 // indirect + github.com/cespare/xxhash/v2 v2.2.0 // indirect + github.com/docker/distribution v2.8.1+incompatible // indirect + github.com/docker/go-connections v0.4.0 // indirect + github.com/docker/go-units v0.5.0 // indirect + github.com/gogo/protobuf v1.3.2 // indirect + github.com/golang/protobuf v1.5.3 // indirect + github.com/matttproud/golang_protobuf_extensions v1.0.4 // indirect + github.com/moby/term v0.0.0-20230501114404-2ff7073d9493 // indirect + github.com/morikuni/aec v1.0.0 // indirect + github.com/opencontainers/go-digest v1.0.0 // indirect + github.com/opencontainers/image-spec v1.0.2 // indirect + github.com/pkg/errors v0.9.1 // indirect + github.com/pmezard/go-difflib v1.0.0 // indirect + github.com/prometheus/client_model v0.3.0 // indirect + github.com/prometheus/common v0.42.0 // indirect + github.com/prometheus/procfs v0.9.0 // indirect + golang.org/x/mod v0.8.0 // indirect + golang.org/x/net v0.7.0 // indirect + golang.org/x/sys v0.6.0 // indirect + golang.org/x/time v0.3.0 // indirect + golang.org/x/tools v0.6.0 // indirect + google.golang.org/protobuf v1.30.0 // indirect + gotest.tools/v3 v3.4.0 // indirect +) diff --git a/go.sum b/go.sum new file mode 100644 index 0000000..4763df5 --- /dev/null +++ b/go.sum @@ -0,0 +1,98 @@ +github.com/Azure/go-ansiterm v0.0.0-20210617225240-d185dfc1b5a1 h1:UQHMgLO+TxOElx5B5HZ4hJQsoJ/PvUvKRhJHDQXO8P8= +github.com/Microsoft/go-winio v0.6.1 h1:9/kr64B9VUZrLm5YYwbGtUJnMgqWVOdUAXu6Migciow= +github.com/Microsoft/go-winio v0.6.1/go.mod h1:LRdKpFKfdobln8UmuiYcKPot9D2v6svN5+sAH+4kjUM= +github.com/beorn7/perks v1.0.1 h1:VlbKKnNfV8bJzeqoa4cOKqO6bYr3WgKZxO8Z16+hsOM= 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/dev/null +++ b/main.go @@ -0,0 +1,79 @@ +package main + +import ( + "bytes" + "context" + "io" + "log" + "net/http" + "time" + + "github.com/docker/docker/api/types" + "github.com/docker/docker/client" + "github.com/prometheus/client_golang/prometheus" + "github.com/prometheus/client_golang/prometheus/promauto" + "github.com/prometheus/client_golang/prometheus/promhttp" +) + +var ( + recentLogCountVec = promauto.NewGaugeVec(prometheus.GaugeOpts{ + Namespace: "dockerx", + Name: "container_log_count_last_12_hours", + Help: "Number of log entries for htis container in the last 12 hours", + }, []string{"container"}) +) + +func main() { + http.Handle("/metrics", promhttp.Handler()) + go containerLogs() + + log.Printf("Starting server at port 2112\n") + if err := http.ListenAndServe(":2112", nil); err != nil { + log.Printf("error: %v", err) + } +} + +func containerLogs() { + for { + cli, err := client.NewClientWithOpts(client.FromEnv) + defer cli.Close() + if err != nil { + panic(err) + } + + logOpts := types.ContainerLogsOptions{ + ShowStderr: true, + ShowStdout: true, + Since: "12h", // new logs in the last 12 hours + } + + containers, err := cli.ContainerList(context.Background(), types.ContainerListOptions{}) + for _, container := range containers { + logs, err := cli.ContainerLogs(context.Background(), container.ID, logOpts) + if err != nil { + log.Fatal(err) + } + logEntryCount, err := countLogLines(logs) + if err != nil { + log.Println("error counting logs: ", err) + } + recentLogCountVec.WithLabelValues(container.Names[0]).Set(logEntryCount) + } + time.Sleep(3 * time.Second) + } +} + +func countLogLines(logs io.ReadCloser) (float64, error) { + var buf bytes.Buffer + _, err := io.Copy(&buf, logs) + if err != nil { + return 0, err + } + logData := buf.Bytes() + newLine := []byte{'\n'} + lines := bytes.Count(logData, newLine) + if len(logData) > 0 && !bytes.HasSuffix(logData, newLine) { + lines++ + } + return float64(lines), nil +}