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container-logs
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Initial Commit

This commit is contained in:
Markus Pesch 2020-11-21 10:27:06 +01:00
commit 09898e8730
Signed by: volker.raschek
GPG Key ID: 852BCC170D81A982
10 changed files with 593 additions and 0 deletions
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kind: pipeline
type: docker
name: amd64
steps:
- name: build-linux-amd64
image: docker.io/volkerraschek/build-image:latest
commands:
- make --jobs=$(nproc) bin/linux/amd64/container-logs
when:
event:
- push
- pull_request
- tag

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root = true
[*]
indent_style = space
indent_size = 2
end_of_line = lf
charset = utf-8
trim_trailing_whitespace = true
insert_final_newline = false

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Makefile eol=lf txt

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bin
coverage.txt

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Copyright 2020 Markus Pesch
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.

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# VERSION
# If no version is specified as a parameter of make, the last git hash
# value is taken.
VERSION?=$(shell git describe --abbrev=0)+$(shell date +'%Y%m%d%H%I%S')
# GOPROXY settings
# If no GOPROXY environment variable available, the pre-defined GOPROXY from go
# env to download and validate go modules is used. Exclude downloading and
# validation of all private modules which are pre-defined in GOPRIVATE. If no
# GOPRIVATE variable defined, the variable of go env is used.
GOPROXY?=$(shell go env GOPROXY)
GOPRIVATE?=$(shell go env GOPRIVATE)
# CONTAINER_RUNTIME
# The CONTAINER_RUNTIME variable will be used to specified the path to a
# container runtime. This is needed to start and run a container images.
CONTAINER_RUNTIME?=$(shell which docker)
CONTAINER_IMAGE_VERSION?=latest
# EXECUTABLE
EXECUTABLE=container-logs
# BUILD
# ==============================================================================
${EXECUTABLE}: bin/tmp/${EXECUTABLE}
all: ${EXECUTABLE_TARGETS}
bin/linux/amd64/${EXECUTABLE}:
GOOS=linux \
GOARCH=amd64 \
GOPROXY=${GOPROXY} \
GOPRIVATE=${GOPRIVATE} \
go build -ldflags "-X main.version=${VERSION:v%=%}" -o ${@} main.go
bin/tmp/${EXECUTABLE}:
GOPROXY=${GOPROXY} \
GOPRIVATE=${GOPRIVATE} \
go build -ldflags "-X main.version=${VERSION:v%=%}" -o ${@} main.go
# CLEAN
# ==============================================================================
PHONY+=clean
clean:
rm --force --recursive ${EXECUTABLE}
rm --force --recursive bin
# PHONY
# ==============================================================================
.PHONY: ${PHONY}

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# container-logs
[![Build Status](https://drone.cryptic.systems/api/badges/volker.raschek/container-logs/status.svg)](https://drone.cryptic.systems/volker.raschek/container-logs)
[![PkgGoDev](https://pkg.go.dev/badge/git.cryptic.systems/volker.raschek/container-logs)](https://pkg.go.dev/git.cryptic.systems/volker.raschek/container-logs)
container-log is a utility program. It writes the logs from docker container to
stdout. The containers can be specified by ame or ID like the `docker logs`
command. In addition, `container-logs` offers the possibility to search for
containers by their labels.
## Usage
The following chapter contains examples how to use `container-logs`.
All examples are about an nginx and oracle container. The nginx container has
the name `nginx` and the id `59a6358197ef`. The oracle container has the name
`oracle` and the id `9d0bb88fa6a1`
### Logs without any restrictions
When container-logs is run without restriction, the logs that write the
containers to stdout and stderr are printed on standard system output.
```bash
$ container-logs
[0.000] 127.0.0.1 - - [20/Nov/2020:18:57:16 +0000] "HEAD /index.html HTTP/1.1" 200 0 "-" "curl/7.29.0" "-"
[0.000] 127.0.0.1 - - [20/Nov/2020:18:57:56 +0000] "HEAD /index.html HTTP/1.1" 200 0 "-" "curl/7.29.0" "-"
[0.000] 127.0.0.1 - - [20/Nov/2020:18:58:37 +0000] "HEAD /index.html HTTP/1.1" 200 0 "-" "curl/7.29.0" "-"
...
SQL*Plus: Release 11.2.0.2.0 Production on Fri Nov 20 14:56:25 2020
Copyright (c) 1982, 2011, Oracle. All rights reserved.
Connected to:
Oracle Database 11g Express Edition Release 11.2.0.2.0 - 64bit Production
```
### Logs by container name
Containers whose logs write to standard output and standard error output can
also be selected by name.
In the following example only the logs of the container nginx are output. The
container is selected by its name.
```bash
$ container-logs --name nginx
[0.000] 127.0.0.1 - - [20/Nov/2020:18:57:16 +0000] "HEAD /index.html HTTP/1.1" 200 0 "-" "curl/7.29.0" "-"
[0.000] 127.0.0.1 - - [20/Nov/2020:18:57:56 +0000] "HEAD /index.html HTTP/1.1" 200 0 "-" "curl/7.29.0" "-"
[0.000] 127.0.0.1 - - [20/Nov/2020:18:58:37 +0000] "HEAD /index.html HTTP/1.1" 200 0 "-" "curl/7.29.0" "-"
...
```
The flag `--n, --name` can be used multiple times to select multiple containers.
### Logs by container id
The behaviour of `-i, --id` is similar to `-n, --name`. It can be specified
multiple times. It selects by the ID of the container instead of by name. The ID
does not need to be specified fully qualified. The first characters of the ID
are sufficient.
### Logs by container labels
Outputting the logs of containers, selected by their labels, is the real reason
for implementing this little program. Containers are only selected if all
labels, which were passed, are also defined in the container image.
In the following example the container nginx is selected by one of its labels.
```bash
$ container-logs --label "maintainer=NGINX Docker Maintainers <docker-maint@nginx.com>"
[0.000] 127.0.0.1 - - [20/Nov/2020:18:57:16 +0000] "HEAD /index.html HTTP/1.1" 200 0 "-" "curl/7.29.0" "-"
[0.000] 127.0.0.1 - - [20/Nov/2020:18:57:56 +0000] "HEAD /index.html HTTP/1.1" 200 0 "-" "curl/7.29.0" "-"
[0.000] 127.0.0.1 - - [20/Nov/2020:18:58:37 +0000] "HEAD /index.html HTTP/1.1" 200 0 "-" "curl/7.29.0" "-"
```
To find the labels of a container, you can use the inspect sub-command of
docker. Here is an example:
```bash
$ docker inspect nginx:alpine
...
"Labels": {
"maintainer": "NGINX Docker Maintainers <docker-maint@nginx.com>"
},
...
```

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module git.cryptic.systems/volker.raschek/container-log
go 1.15
require (
git.cryptic.systems/volker.raschek/dockerutils v0.1.0 // indirect
github.com/spf13/cobra v1.1.1 // indirect
)

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github.com/spf13/pflag v1.0.3/go.mod h1:DYY7MBk1bdzusC3SYhjObp+wFpr4gzcvqqNjLnInEg4=
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github.com/tmc/grpc-websocket-proxy v0.0.0-20190109142713-0ad062ec5ee5/go.mod h1:ncp9v5uamzpCO7NfCPTXjqaC+bZgJeR0sMTm6dMHP7U=
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golang.org/x/crypto v0.0.0-20181029021203-45a5f77698d3/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4=
golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
golang.org/x/crypto v0.0.0-20190510104115-cbcb75029529/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
golang.org/x/crypto v0.0.0-20190605123033-f99c8df09eb5/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
golang.org/x/crypto v0.0.0-20200622213623-75b288015ac9/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
golang.org/x/exp v0.0.0-20190121172915-509febef88a4/go.mod h1:CJ0aWSM057203Lf6IL+f9T1iT9GByDxfZKAQTCR3kQA=
golang.org/x/exp v0.0.0-20190306152737-a1d7652674e8/go.mod h1:CJ0aWSM057203Lf6IL+f9T1iT9GByDxfZKAQTCR3kQA=
golang.org/x/exp v0.0.0-20190510132918-efd6b22b2522/go.mod h1:ZjyILWgesfNpC6sMxTJOJm9Kp84zZh5NQWvqDGG3Qr8=
golang.org/x/exp v0.0.0-20190829153037-c13cbed26979/go.mod h1:86+5VVa7VpoJ4kLfm080zCjGlMRFzhUhsZKEZO7MGek=
golang.org/x/exp v0.0.0-20191030013958-a1ab85dbe136/go.mod h1:JXzH8nQsPlswgeRAPE3MuO9GYsAcnJvJ4vnMwN/5qkY=
golang.org/x/image v0.0.0-20190227222117-0694c2d4d067/go.mod h1:kZ7UVZpmo3dzQBMxlp+ypCbDeSB+sBbTgSJuh5dn5js=
golang.org/x/image v0.0.0-20190802002840-cff245a6509b/go.mod h1:FeLwcggjj3mMvU+oOTbSwawSJRM1uh48EjtB4UJZlP0=
golang.org/x/lint v0.0.0-20181026193005-c67002cb31c3/go.mod h1:UVdnD1Gm6xHRNCYTkRU2/jEulfH38KcIWyp/GAMgvoE=
golang.org/x/lint v0.0.0-20190227174305-5b3e6a55c961/go.mod h1:wehouNa3lNwaWXcvxsM5YxQ5yQlVC4a0KAMCusXpPoU=
golang.org/x/lint v0.0.0-20190301231843-5614ed5bae6f/go.mod h1:UVdnD1Gm6xHRNCYTkRU2/jEulfH38KcIWyp/GAMgvoE=
golang.org/x/lint v0.0.0-20190313153728-d0100b6bd8b3/go.mod h1:6SW0HCj/g11FgYtHlgUYUwCkIfeOF89ocIRzGO/8vkc=
golang.org/x/lint v0.0.0-20190409202823-959b441ac422/go.mod h1:6SW0HCj/g11FgYtHlgUYUwCkIfeOF89ocIRzGO/8vkc=
golang.org/x/lint v0.0.0-20190909230951-414d861bb4ac/go.mod h1:6SW0HCj/g11FgYtHlgUYUwCkIfeOF89ocIRzGO/8vkc=
golang.org/x/lint v0.0.0-20190930215403-16217165b5de/go.mod h1:6SW0HCj/g11FgYtHlgUYUwCkIfeOF89ocIRzGO/8vkc=
golang.org/x/mobile v0.0.0-20190312151609-d3739f865fa6/go.mod h1:z+o9i4GpDbdi3rU15maQ/Ox0txvL9dWGYEHz965HBQE=
golang.org/x/mobile v0.0.0-20190719004257-d2bd2a29d028/go.mod h1:E/iHnbuqvinMTCcRqshq8CkpyQDoeVncDDYHnLhea+o=
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golang.org/x/net v0.0.0-20180724234803-3673e40ba225/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
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golang.org/x/net v0.0.0-20181114220301-adae6a3d119a/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
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golang.org/x/net v0.0.0-20190108225652-1e06a53dbb7e/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
golang.org/x/net v0.0.0-20190213061140-3a22650c66bd/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
golang.org/x/net v0.0.0-20190311183353-d8887717615a/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
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golang.org/x/net v0.0.0-20190501004415-9ce7a6920f09/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
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golang.org/x/net v0.0.0-20190603091049-60506f45cf65/go.mod h1:HSz+uSET+XFnRR8LxR5pz3Of3rY3CfYBVs4xY44aLks=
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golang.org/x/net v0.0.0-20201031054903-ff519b6c9102/go.mod h1:sp8m0HH+o8qH0wwXwYZr8TS3Oi6o0r6Gce1SSxlDquU=
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@ -0,0 +1,103 @@
package main
import (
"context"
"io"
"os"
"strings"
"git.cryptic.systems/volker.raschek/dockerutils"
"github.com/docker/docker/api/types"
"github.com/docker/docker/api/types/filters"
"github.com/spf13/cobra"
)
var (
version string
allContainers bool
ids []string
names []string
rawLabels []string
printStderr bool
printStdout bool
)
func main() {
rootCmd := &cobra.Command{
Use: "container-log",
Short: "Write logs of containers on stdout",
Version: version,
RunE: runRootCmd,
}
rootCmd.Flags().BoolVarP(&allContainers, "all", "a", false, "All containers, including those that are switched off or aborted")
rootCmd.Flags().StringArrayVarP(&ids, "id", "i", make([]string, 0), "Select container by id")
rootCmd.Flags().StringArrayVarP(&names, "name", "n", make([]string, 0), "Select container by name")
rootCmd.Flags().StringArrayVarP(&rawLabels, "label", "l", make([]string, 0), "Select container by labels")
rootCmd.Execute()
}
func runRootCmd(cmd *cobra.Command, args []string) error {
dockerClient, err := dockerutils.New()
if err != nil {
return err
}
ctx := context.Background()
filterArgs := filters.NewArgs()
if len(rawLabels) > 0 {
for i := range rawLabels {
filterArgs.Add("label", rawLabels[i])
}
}
if len(names) > 0 {
for i := range names {
filterArgs.Add("name", names[i])
}
}
containers, err := dockerClient.ContainerList(ctx, types.ContainerListOptions{
All: allContainers,
Filters: filterArgs,
})
if err != nil {
return err
}
if len(ids) > 0 {
containers = filterByIDs(containers, ids...)
}
for i := range containers {
rc, err := dockerClient.ContainerLogs(ctx, containers[i].ID, types.ContainerLogsOptions{ShowStderr: true, ShowStdout: true})
if err != nil {
return err
}
defer rc.Close()
_, err = io.Copy(os.Stdout, rc)
if err != nil {
return err
}
}
return nil
}
func filterByIDs(containers []types.Container, ids ...string) []types.Container {
cachedContainers := make([]types.Container, 0)
LOOP:
for i := range containers {
for j := range ids {
if strings.HasPrefix(containers[i].ID, ids[j]) {
cachedContainers = append(cachedContainers, containers[i])
continue LOOP
}
}
}
return cachedContainers
}