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Hyper-V is an environment for running Docker on the Windows operating system, which is a wrapper (lightweight virtual machine) of the container.
Docker has branched off its core components, which it uses as primitives, which have become standard components for implementing containers such as RKT, bundled into the containerd project:
* CRI-O – OpanSource project aimed from the beginning to fully support CRI (Container Runtime Interface) standards, github.com/opencontainers/runtime-spec/">Runtime Specification and github.com/opencontainers/image-spec">Image Specification as a general interface for the interaction of the orchestration system with containers. Along with Docker, support for CRI-O 1.0 has been added to Kubernetes (more on this) since version 1.7 in 2007, as well as MiniKube and Kubic. Has a CLI (Common Line Interface) implementation in the Pandom project, which almost completely repeats Docker commands, but without orchestration (Docker Swarm), which is the default tool in Linux Fedora.
* CRI (Kubernetes.io/blog/2016/12/container-runtime-interface-cri-in-Kubernetes/">Container Runtime Interface) – an environment for running containers, universally providing primitives (Executor, Supervisor, Metadata, Content, Snapshot , Events and Metrics) for working with Linux containers (process spaces, groups, etc.).
** CNI (Container Networking Interface) – work with the network.
Portainer
The simplest monitoring option would be Portainer:
essh @ kubernetes-master: ~ / microKubernetes $ cat << EOF> docker-compose.monitoring.yml
version: '2'
>
services:
portainer:
image: portainer / portainer
command: -H unix: ///var/run/Docker.sock
restart: always
ports:
– 9000: 9000
volumes:
– /var/run/Docker.sock:/var/run/Docker.sock
– ./portainer_data:/data
>
EOF
essh @ kubernetes-master: ~ / microKubernetes $ docker-compose -f docker-compose.monitoring.yml up -d
Monitoring with Prometheus
Monitoring – maintaining the continuity of work, tracking the current situation (identifying, localizing and sending about the incident, for example, in SaaS PagerDuty), predicting possible situations, visualization, building models for the normal operation of IAOps (Artificial Intelligence For It Operations, https: //www.gartner .com / en / information-technology / glossary / aiops-artificial-intelligence-operations).
Monitoring contains the following steps:
* identification of the incident;
* notification of the incident;
* localization;
* decision.
Monitoring can be classified by level into the following types:
* infrastructure (operating system, servers, Kubernetes, DBMS),;
* applied (application logs, traces, application events),;
* business processes (points in transactions, traces of transactions).
Monitoring can be classified according to the principle:
* distributed (traces),;
* synthetic (availability),;
* IAOps (forecasting, anomalies).
Monitoring is divided into two parts according to the degree of analysis: logging systems and incident investigation systems. An example of logging
serves as ELK stack, and incident investigation – Sentry (SaaS). For micro-services, a tracing system is also added.
requests such as Jeger or Zipkin. The logging system simply writes all the logs that are available.
The incident investigation system writes much more information, but writes it only in case of errors in the application, for example,
environment parameters, versions of installed packages, stack trace and so on, which allows you to get maximum information when viewing
by mistake, rather than collecting it piece by piece from the server and the GIT repository. But the set and format of information depends on the environment, therefore
the incident system needs to be integrated with various language platforms, and even better with specific frameworks. So Sentry
poisons environment variables, a piece of code and an indication of where the error occurred, parameters of the program and platform
environments, method calls.
Ecosystem monitoring can be divided into:
* Built into Cloud Cloud: Azure Monitoring, Amazon CloudWatch, Google Cloud Monitoring
* Provided as a service with support for various SaaS integrations: DataDog, NewRelic
* CloudNative: Prometheus
* For dedicated servers OnPremis: Zabbix
Zabbix was developed in 1998 and released to OpenSource under the GPL in 2001. At that time, the traditional interface:
without any design, with a lot of tabs, selectors and the like. Since it was developed for
own needs, it contains specific solutions. He is oriented
monitoring devices and their components such as disks, networks, printers, routers and the like. For
interactions can be used:
Agents – installed on servers, collecting many metrics and poisoning Zabbix server
HTTP – Zabbix makes requests over http, for example printers
SNMP – a network protocol for communicating with network devices
IPMI is a protocol for communicating with server devices such as routers
In 2019, Gratner presented a rating of monitoring systems in its square:
** Dynatrace;
** Cisco (AppDynamics);
** New Relic;
** Broadcom (CA Technologies);
** Riverbed and Microsoft;
** IBM;
** Oracle;
** SolarWinds;
** Micro Focus;
** ManageEngine and Tingyun.
Not included in the square:
** Correlsense;
** Datadog;
** Elastic;
** Honeycomb;
** Instant;
** Jennifer Soft;
** Light Step;
** Nastel Technologies;
** SignalFx;
** Splunk;
** Sysdig.
When we run an application in a Docker container, all the standard output (what is displayed in the console) of the running program (process) is buffered. We can view this buffer with the docker logs name_container program . If we follow the Docker ideology – "one process, one container" – we can view the logs of an individual program. It is convenient to use the less and tail commands to view logs. The first program allows you to conveniently scroll through the logs with the keyboard arrows, search for the desired one based on matches and using a regular expression pattern, like the text editor vi . The second program displays the amount we need
An important criterion for ensuring smooth operation is the control of free space. So, if there is no space left, then the database will not be able to write data, with other components the situation can be more dire than the