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https://github.com/decryptus/monit-docker

Monitor docker containers resources usage and execute docker commands or inside containers
https://github.com/decryptus/monit-docker

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Monitor docker containers resources usage and execute docker commands or inside containers

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# monit-docker project



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monit-docker is a free and open-source, we develop it to monitor container status or resources

and execute some commands inside containers or manage containers with dockerd, for example:

 - reload php-fpm if memory usage is too high

 - reload php-fpm if no free space in /dev/shm

 - restart container if status is not running

 - remove all containers



## Table of contents

1. [Quickstart](#quickstart)

2. [Installation](#installation)

3. [Environment variables](#environment_variables)

4. [Sub-command: monit](#sub-command_monit)

    1. [Basic commands](#monit_basic_commands)

    2. [Advanced commands](#monit_advanced_commands)

    3. [Container informations with exit codes](#monit_container_informations)

    4. [monit-docker with M/Monit](#monit_with_mmonit)

5. [Sub-command: stats](#sub-command_stats)

    1. [Basic commands](#stats_basic_commands)

    2. [Advanced commands](#stats_advanced_commands)



## Quickstart



Using monit-docker in Docker with crond



`docker-compose up -d`



See [docker-compose.yml](docker-compose.yml) and MONIT\_DOCKER\_CRONS environment variable to configure commands.



## Installation



`pip install monit-docker`



## Environment variables



| Variable                   | Description                 | Default |

|:---------------------------|:----------------------------|:--------|

| `MONIT_DOCKER_CONFIG`      | Configuration file contents
(e.g. `export MONIT_DOCKER_CONFIG="$(cat monit-docker.yml)"`) |  |

| `MONIT_DOCKER_CONFFILE`    | Configuration file path     | /etc/monit-docker/monit-docker.yml |

| `MONIT_DOCKER_LOGFILE`     | Log file path               | /var/log/monit-docker/monit-docker.log |

| `MONIT_DOCKER_RUNTIMEDIR`  | Runtime directory path      | /run/monit-docker |



## Sub-command: monit



### Basic commands



Restart containers with name starts with foo if memory usage percentage > 60% or cpu usage percentage > 90%:



`monit-docker --name 'foo*' monit --cmd-if 'mem_percent > 60 ? restart' --cmd-if 'cpu_percent > 90 ? restart'`



Stop containers with name starts with bar or foo and if cpu usage percentage greater than 60% and less than 70%:



`monit-docker --name 'bar*' --name 'foo*' monit --cmd-if '60 > cpu_percent < 70 ? stop'`



Kill containers with name starts with bar and status equal to pause or running:



`monit-docker --name 'bar*' monit --cmd-if 'status in (pause,running) ? kill'`



You can also use status argument, for example, restart containers with status paused or exited:



`monit-docker -s paused -s exited monit --cmd 'restart'`



Generate containers pidfile:



`monit-docker monit --rsc pid`



Reload php-fpm in container with image name contains /php-fpm/ if memory usage greater than 100 MiB:



`monit-docker --image '*/php-fpm/*' monit --cmd-if 'mem_usage > 100 MiB ? (kill -USR2 1)'`



Reload php-fpm in container with image name contains /php-fpm/ if /dev/shm percentage usage greater than 80%:



`monit-docker --image '*/php-fpm/*' monit --cmd '(bash -c "[ $(df /dev/shm | sed \"s/\%//;\$!d\" | awk \"{print \$5}\") -gt 80 ] && kill -USR2 1")'`



### Advanced commands with configuration file or environment variable MONIT\_DOCKER\_CONFIG



##### Run commands with aliases declared in configuration file (e.g.: [monit-docker.yml.example](etc/monit-docker/monit-docker.yml.example)):



Restart container id 4c01db0b339c if condition alias @status\_not\_running is true:



`monit-docker --id 4c01db0b339c monit --cmd-if '@status_not_running ? restart'`



Execute commands alias @start\_pause containers with name starts with foo if condition alias @status\_not\_running is true:



`monit-docker --name 'foo*' monit --cmd-if '@status_not_running ? @start_pause'`



Remove force container group php if status is equal to running:



`monit-docker --ctn-group php monit --cmd-if 'status == running ? @remove_force'`



Restart containers group nodejs if memory usage percentage > 10% and cpu usage percentage > 60%:



`monit-docker --ctn-group nodejs monit --cmd-if '@mem_gt_10pct_and_cpu_gt_60pct ? restart'`



Remove force all containers:



`monit-docker monit --cmd '@remove_force'`



### Container informations with exit codes



##### Container status



Run command below to get status with exit code for container named foo\_php\_fpm:



`monit-docker --name foo_php_fpm monit --rsc status`



An error occurred if exit code is greater than 100.



| Exit code | Description |

|:----------|:------------|

| 0         | Running     |

| 10        | Created     |

| 20        | Paused      |

| 30        | Restarting  |

| 40        | Removing    |

| 50        | Exited      |

| 60        | Dead        |

| 114       | Not found   |



##### Container CPU usage percentage



Run command below to get CPU usage percentage with exit code for container named foo\_php\_fpm:



`monit-docker --name foo_php_fpm monit --rsc cpu_percent`



An error occurred if exit code is greater than 100.



##### Container memory usage percentage



Run command below to get memory usage percentage with exit code for container named foo\_php\_fpm:



`monit-docker --name foo_php_fpm monit --rsc mem_percent`



An error occurred if exit code is greater than 100.



### monit-docker with M/Monit



We can also monitoring containers cpu\_percent and mem\_percent resources with [M/Monit](https://mmonit.com).



##### Configuration examples



```

check program docker.foo_php_fpm.status with path "/usr/bin/monit-docker --name foo_php_fpm monit --rsc status"

    group monit-docker

    if status = 114 for 2 cycles then alert # container not found

    if status != 0 for 2 cycles then exec "/usr/bin/monit-docker --name foo_php_fpm monit --cmd restart" # container not running



check program docker.foo_php_fpm.cpu with path "/usr/bin/monit-docker -s running --name foo_php_fpm monit --rsc cpu_percent"

    group monit-docker

    if status > 100 for 2 cycles then alert

    if status > 70 for 2 cycles then alert

    if status > 80 for 4 cycles then exec "/usr/bin/monit-docker --name foo_php_fpm monit --cmd reload"



check program docker.foo_php_fpm.mem with path "/usr/bin/monit-docker -s running --name foo_php_fpm monit --rsc mem_percent"

    group monit-docker

    if status > 100 for 2 cycles then alert

    if status > 70 for 2 cycles then alert

    if status > 80 for 4 cycles then exec "/usr/bin/monit-docker --name foo_php_fpm monit --cmd '(kill -USR2 1)'"



check program docker.foo_php_fpm.pid with pidfile /run/monit-docker/foo_php_fpm.pid

    group monit-docker

    if changed pid then alert



```



## Sub-command: stats



### Basic commands



Get all resources statistics for all containers in json format:



`monit-docker stats --output json`



```json

{

  "flamboyant_chaplygin": {

    "status": "running",

    "mem_percent": 0.03,

    "net_tx": "0.0 B",

    "cpu_percent": 0,

    "mem_usage": "2.52 MiB",

    "io_read": "3.5 MB",

    "io_write": "0.0 B",

    "net_rx": "25.2 kB",

    "mem_limit": "7.27 GiB",

    "pid": "3943"

  }

}

{

  "practical_proskuriakova": {

    "status": "running",

    "mem_percent": 0.04,

    "net_tx": "0.0 B",

    "cpu_percent": 0,

    "mem_usage": "2.61 MiB",

    "io_read": "24.6 kB",

    "io_write": "0.0 B",

    "net_rx": "25.0 kB",

    "mem_limit": "7.27 GiB",

    "pid": "3990"

  }

}

```



Get all resources statistics for all containers in text format:



`monit-docker stats --output text`



```

flamboyant_chaplygin|mem_usage:2.52 MiB|mem_limit:7.27 GiB|mem_percent:0.03|cpu_percent:0.0|io_read:3.5 MB|io_write:0.0 B|net_tx:0.0 B|net_rx:43.5 kB|status:running

practical_proskuriakova|mem_usage:2.61 MiB|mem_limit:7.27 GiB|mem_percent:0.04|cpu_percent:0.0|io_read:24.6 kB|io_write:0.0 B|net_tx:0.0 B|net_rx:43.3 kB|status:running

```



### Advanced commands with configuration file or environment variable MONIT\_DOCKER\_CONFIG



Get status and memory usage for group nodejs:



`monit-docker --ctn-group nodejs stats --rsc status --rsc mem_usage`