Installation¶
This is going to take some time.
Intended audience¶
Skyline is not really a localhost
application, it needs lots of data, unless
you have a localhost
Graphite or pickle Graphite to your localhost.
Given the specific nature of Skyline, it is assumed that the audience will have a certain level of technical knowledge, e.g. it is assumed that the user will be familiar with the installation, configuration, operation and security practices and considerations relating to the following components:
- Graphite
- Redis
- MySQL
- Apache (or nginx although there are no examples here)
- memcached
However, these types of assumptions even if stated are not useful or helpful to someone not familiar with all the ins and outs of some required thing. This installation document is specifically related to the required installs and configurations of things that are directly related Skyline. Although it cannot possibly cover all possible set ups or scenarios, it does describe recommendations in terms of configurations of the various components and how and where they should be run in relation to Skyline. There are no cfengine, puppet, chef, ansible or docker patterns here.
The documentation is aimed at installing Skyline securely by default. It is possible to run Skyline very insecurely, however this documentation does not specify how to do that. Both the set up and documentation are verbose. Setting up Skyline takes a while.
Skyline’s default settings and documentation are aimed to run behind a SSL terminated and authenticated reverse proxy and use Redis authentication. This makes the installation process more tedious, but it means that all these inconvenient factors are not left as an after thought or added to some TODO list or issue when you decide after trying Skyline, “Yes! I want to Skyline, this is cool”.
For notes regarding automation and configuration management see the section at the end of this page.
What the components do¶
- Graphite - sends metric data to Skyline Horizon via a pickle. Graphite is a separate application that will probably be running on another server, although Graphite could run on the same server, in a production environment it would probably be a remote machine or container. Graphite is not part of Skyline.
- Redis - stores
settings.FULL_DURATION
seconds (usefully 24 hours worth) of time series data that Graphite sends to Skyline Horizon. Skyline Analyzer pulls the data from Redis for analysis. Redis must run on the same host as Skyline. It may be possible to run Redis in another container or VM that was on the same host, but this has not been tested. - MySQL/mariadb - stores data about anomalies and time series features fingerprints for learning things that are not anomalous. MySQL can run on the same host as Skyline or it can be remote.
- Apache (or nginx) - serves the Skyline webapp via gunicorn and handles SSL termination and basic http auth. Ideally should run on the same host as Skyline.
- memcached - caches Ionosphere MySQL data, memcached should ideally be run on the same host as Skyline.
sudo
¶
Use sudo
appropriately for your environment wherever necessary.
Steps¶
Note
All the documentation and testing is based on running Skyline in a Python-2.7.16 virtualenv, if you choose to deploy Skyline another way, you are on your own. Although it is possible to run Skyline in a different type of environment, it does not lend itself to repeatability or a common known state. Python-2.7.14 should still work as well, but all documentation has been updated to use Python-2.7.16.
Skyline configuration¶
All Skyline configuration is handled in skyline/settings.py
and in this
documentation configuration options are referred to via their docstrings name
e.g. settings.FULL_DURATION
which links to their description in the
documentation.
Python virtualenv¶
- Create a python-2.7.16 virtualenv for Skyline to run in see Running in Python virtualenv (Python-2.7.14 should still work as well).
Firewall¶
- Please set up all the firewall rules to restrict access to the following
before you continue to install the other components:
- The IP address and port being used to reverse proxy the Webapp e.g.
<YOUR_SERVER_IP_ADDRESS>:443, ensure that this is only accessible to
specified IPs in iptables/ip6tables (further these addresses should also be
added to the reverse proxy conf as
Allow from
defines when you create the reverse proxy conf file). - The IP address and port being used by MySQL/mariadb, if you are not binding
MySQL/mariadb to 127.0.0.1 only, ensure that the MySQL/mariadb port declared
in
settings.PANORAMA_DBPORT
(default 3306) is only accessible to specified IPs in iptables/ip6tables - Allow the IP address of your Graphite server/s on ports 2024 and 2025 (the default Graphite pickle ports)
- The IP address and port being used by Redis, which if you are not running multiple distributed Skyline instances should be 127.0.0.1, even if you are running multiple distributed Skyline instances this can and still should be 127.0.0.1 as Skyline makes an API endpoint available to remote Skyline instances for any required remote Redis data retrieval and preprocessing.
- Please ensure you handle all of these with iptables AND ip6tables (or the equivalent) before continuing.
- The IP address and port being used to reverse proxy the Webapp e.g.
<YOUR_SERVER_IP_ADDRESS>:443, ensure that this is only accessible to
specified IPs in iptables/ip6tables (further these addresses should also be
added to the reverse proxy conf as
Dawn¶
- Should you wish to review the build steps, component builds and installs described below, there is a convenience build script for testing purposes only in utils/dawn/skyline.dawn.sh see Dawn section)
Redis¶
- Install Redis - see Redis.io
- Ensure that you review https://redis.io/topics/security
- Ensure Redis has socket enabled with the following permissions in your redis.conf
unixsocket /tmp/redis.sock
unixsocketperm 777
Note
The unixsocket on the apt redis-server package is
/var/run/redis/redis.sock
if you use this path ensure you change
settings.REDIS_SOCKET_PATH
to this path
- Ensure Redis has a long
requirepass
set in redis.conf - Ensure Redis
bind
is set in redis.conf, consider specifically statingbind 127.0.0.1
even if you are going to run multiple distributed Skyline instances, Skyline gets remote Redis data preprocessed via a Skyline API so there is no need to bind Redis to any other IP. - Start Redis
memcached¶
- Install memcached and start memcached see memcached.org
- Ensure that you start memcached only bound to 127.0.0.1 by passing the daemon
the option
-l 127.0.0.1
, Skyline only requires memcached locally.
Skyline directories¶
- Make the required directories
mkdir /var/log/skyline
mkdir /var/run/skyline
mkdir /var/dump
mkdir -p /opt/skyline/panorama/check
mkdir -p /opt/skyline/mirage/check
mkdir -p /opt/skyline/crucible/check
mkdir -p /opt/skyline/crucible/data
mkdir -p /opt/skyline/ionosphere
mkdir /etc/skyline
mkdir /tmp/skyline
Note
Ensure you provide the appropriate ownership and permissions to the above specified directories for the user you wish to run the Skyline process as.
Skyline and dependencies install¶
- git clone Skyline (git should have been installed in the Running in Python virtualenv section) and it is recommended to then git checkout the commit reference of the latest stable release.
mkdir -p /opt/skyline/github
cd /opt/skyline/github
git clone https://github.com/earthgecko/skyline.git
# If you wish to switch to a specific commit or the latest release
#cd /opt/skyline/github/skyline
#git checkout <COMMITREF>
- Once again using the Python-2.7.16 virtualenv, install the requirements using the virtualenv pip, this can take some time.
Warning
When working with virtualenv Python versions you must always remember to use the activate and deactivate commands to ensure you are using the correct version of Python. Although running a virtualenv does not affect the system Python, not using activate can result in the user making errors that MAY affect the system Python and packages. For example, a user does not use activate and just uses pip not bin/pip2.7 and pip installs some packages. User error can result in the system Python being affected. Get in to the habit of always using explicit bin/pip2.7 and bin/python2.7 commands to ensure that it is harder for you to err.
Warning
If you are running on CentOS 6 mysql-connector-python needs to be fixed to 8.0.6 on CentOS 6 as if you use MySQL 5.1 rpm from mainstream, as of mysql-connector-python 8.0.11 support for 5.1 was dropped and results in a bad handshake error. Further to this there is a reported vulnerability with mysql-connector-python-8.0.6 High severity vulnerability found on mysql-connector-python-8.0.6 desc: Improper Access Control info: https://snyk.io/vuln/SNYK-PYTHON-MYSQLCONNECTORPYTHON-173986 info: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-2435 You have been advised, so now you know.
PYTHON_MAJOR_VERSION="2.7"
PYTHON_VIRTUALENV_DIR="/opt/python_virtualenv"
PROJECT="skyline-py2716"
cd "${PYTHON_VIRTUALENV_DIR}/projects/${PROJECT}"
source bin/activate
# As of statsmodels 0.9.0 numpy, et al need to be installed before
# statsmodels in requirements
# https://github.com/statsmodels/statsmodels/issues/4654
bin/"pip${PYTHON_MAJOR_VERSION}" install $(cat /opt/skyline/github/skyline/requirements.txt | grep "^numpy\|^scipy\|^patsy" | tr '\n' ' ')
bin/"pip${PYTHON_MAJOR_VERSION}" install $(cat /opt/skyline/github/skyline/requirements.txt | grep "^pandas")
# CentOS 6 ONLY
# mysql-connector-python needs to be fixed to 8.0.6 on CentOS 6 as it uses
# MySQL 5.1 rpm from mainstream, as of mysql-connector-python 8.0.11 support
# for 5.1 was dropped and results in a bad handshake error.
if [ -f /etc/redhat-release ]; then
CENTOS=$(cat /etc/redhat-release | grep -c "CentOS")
if [ $CENTOS -eq 1 ]; then
CENTOS_6=$(cat /etc/redhat-release | grep -c "release 6")
if [ $CENTOS_6 -eq 1 ]; then
echo "Replacing mysql-connector-python version in requirements.txt as CentOS 6 requires mysql-connector-python==8.0.6"
cat /opt/skyline/github/skyline/requirements.txt > /opt/skyline/github/skyline/requirements.txt.original
cat /opt/skyline/github/skyline/requirements.txt.original | sed -e 's/^mysql-connector-python==.*/mysql-connector-python==8\.0\.6/g' > /opt/skyline/github/skyline/requirements.txt.centos6
cat /opt/skyline/github/skyline/requirements.txt.centos6 > /opt/skyline/github/skyline/requirements.txt
fi
fi
fi
# This can take lots of minutes...
bin/"pip${PYTHON_MAJOR_VERSION}" install -r /opt/skyline/github/skyline/requirements.txt
deactivate
- Copy the
skyline.conf
and edit theUSE_PYTHON
as appropriate to your set up if it is not using PATH/opt/python_virtualenv/projects/skyline-py2716/bin/python2.7
cp /opt/skyline/github/skyline/etc/skyline.conf /etc/skyline/skyline.conf
vi /etc/skyline/skyline.conf # Set USE_PYTHON as appropriate to your setup
Apache reverse proxy¶
- OPTIONAL but recommended, serving the Webapp via gunicorn with an Apache
reverse proxy.
- Setup Apache (httpd) and see the example configuration file in your cloned
directory
/opt/skyline/github/skyline/etc/skyline.httpd.conf.d.example
modify all the<YOUR_
variables as appropriate for you environment - see Apache and gunicorn - Create a SSL certificate and update the SSL configurations in the Skyline Apache config (or your reverse proxy)
- Setup Apache (httpd) and see the example configuration file in your cloned
directory
SSLCertificateFile "<YOUR_PATH_TO_YOUR_CERTIFICATE_FILE>"
SSLCertificateKeyFile "<YOUR_PATH_TO_YOUR_KEY_FILE>"
SSLCertificateChainFile "<YOUR_PATH_TO_YOUR_CHAIN_FILE_IF_YOU_HAVE_ONE_OTHERWISE_COMMENT_THIS_LINE_OUT>"
- Update your Apache (or reverse proxy config) with the X-Forwarded-Proto header.
RequestHeader set X-Forwarded-Proto "https"
- Add a user and password for HTTP authentication, the user does not have to be admin it can be anything, e.g.
htpasswd -c /etc/httpd/conf.d/.skyline_htpasswd admin
Note
Ensure that the user and password for Apache match the user and
password that you provide in settings.py for
settings.WEBAPP_AUTH_USER
and settings.WEBAPP_AUTH_USER_PASSWORD
- Deploy your Skyline Apache configuration file and restart httpd.
Skyline database¶
- Create the Skyline MySQL/mariadb database for Panorama (see Panorama) and Ionosphere.
Skyline settings¶
- Edit the
skyline/settings.py
file and enter your appropriate settings, specifically ensure you set the following variables to the correct settings for your environment, see the documentation links and docstrings in theskyline/settings.py
file for the full descriptions of each variable. Below are the variables you must set:settings.REDIS_SOCKET_PATH
if different from`/tmp/redis.sock`
settings.REDIS_PASSWORD
settings.GRAPHITE_HOST
settings.GRAPHITE_PROTOCOL
settings.GRAPHITE_PORT
settings.CARBON_PORT
settings.SERVER_METRICS_NAME
settings.CANARY_METRIC
settings.ALERTS
- remember to only add a few key metrics to begin with. If you want Skyline to start working almost immediately AND you have Graphite populated with more than 7 days of data, you can enable and start Mirage too and declare the SECOND_ORDER_RESOLUTION_HOURS in each ALERTS tuple as 168.settings.MIRAGE_ENABLE_ALERTS
set this to`True`
if you want to have Mirage running as described above.settings.SMTP_OPTS
settings.HIPCHAT_OPTS
,settings.PAGERDUTY_OPTS
andsettings.SLACK_OPTS
if to be used, if so ensure thatsettings.HIPCHAT_ENABLED
,settings.PAGERDUTY_ENABLED
andsettings.SLACK_ENABLED
are set toTrue
as appropriate.settings.HORIZON_IP
- If you are deploying with a Skyline MySQL Panorama DB straight away ensure
that
settings.PANORAMA_ENABLED
is set toTrue
and set all the other Panorama related variables as appropriate. Enabling Panorama from the start is RECOMMENDED as it is integral to Ionosphere and Luminosity. settings.WEBAPP_AUTH_USER
settings.WEBAPP_AUTH_USER_PASSWORD
settings.WEBAPP_ALLOWED_IPS
settings.SKYLINE_URL
settings.SERVER_PYTZ_TIMEZONE
settings.MEMCACHE_ENABLED
cd /opt/skyline/github/skyline/skyline
vi settings.py
Note
a special settings variable that needs mentioning is the alerter
settings.SYSLOG_ENABLED
. This variable by default is True
and
in this mode Skyline sends all anomalies to syslog and Panorama to record ALL
anomalies to the database not just anomalies for metrics that have a
settings.ALERTS
tuple defined. However this is the desired default
state. This setting basically enables the anomaly detection on everything
with 3-sigma and builds the anomalies database, it is not noisy. At this
point in your implementation the distinction between alerts and general
Skyline anomaly detection and constructing an anomalies data set must once
again be pointed out.
- For later implementing and working with Ionosphere and setting up learning (see Ionosphere) after you have the other Skyline apps up and running.
- If you are upgrading, at this point return to the Upgrading page.
Starting and testing the Skyline installation¶
- Before you test Skyline by seeding Redis with some test data, ensure that you have configured the firewall/iptables/ip6tables with the appropriate restricted access.
- Start the Skyline apps
/opt/skyline/github/skyline/bin/horizon.d start
/opt/skyline/github/skyline/bin/analyzer.d start
/opt/skyline/github/skyline/bin/webapp.d start
# And Panorama if you have set up in the DB at this stage
/opt/skyline/github/skyline/bin/panorama.d start
/opt/skyline/github/skyline/bin/ionosphere.d start
/opt/skyline/github/skyline/bin/luminosity.d start
- Check the log files to ensure things started OK and are running and there are no errors.
Note
When checking a log make sure you check the log for the appropriate time, Skyline can log fast, so short tails may miss some event you expect between the restart and tail.
# Check what the logs reported when the apps started
head -n 20 /var/log/skyline/*.log
# How are they running
tail -n 20 /var/log/skyline/*.log
# Any errors - each app
find /var/log/skyline -type f -name "*.log" | while read skyline_logfile
do
echo "#####
# Checking for errors in $skyline_logfile"
cat "$skyline_logfile" | grep -B2 -A10 -i "error ::\|traceback" | tail -n 60
echo ""
echo ""
done
- Seed Redis with some test data.
Note
if you are UPGRADING and you are using an already populated Redis store, you can skip seeding data.
cd "${PYTHON_VIRTUALENV_DIR}/projects/${PROJECT}"
source bin/activate
bin/python2.7 /opt/skyline/github/skyline/utils/seed_data.py
deactivate
- Check the Skyline Webapp frontend on the Skyline machine’s IP address and the
appropriate port depending whether you are serving it proxied or direct, e.g
https://YOUR_SKYLINE_IP
. Thehorizon.test.udp
metric anomaly should be in the dashboard after the seed_data.py is complete. If Panorama is set up you will be able to see that in the /panorama view and in the rebrow view as well. - This will ensure that the Horizon service is properly set up and can receive data. For real data, you have some options relating to getting a data pickle from Graphite see Getting data into Skyline
- Check the log files again to ensure things are running and there are no errors.
- Once you have your
settings.ALERTS
configured to test them see Alert testing
Configure Graphite to send data to Skyline¶
- Now you can configure your Graphite to pickle data to Skyline see Getting data into Skyline
- If you have opted to not set up Panorama, later see set up Panorama
Other Skyline components¶
- For Mirage set up see Mirage
- For Boundary set up see Boundary
- For more in-depth Ionosphere set up see Ionosphere
however Ionosphere is only relevant once Skyline has at least
settings.FULL_DURATION
data in Redis.
Automation and configuration management notes¶
The installation of packages in the requirements.txt
can take a long time,
specifically the pandas build. This will usually take longer than the default
timeouts in most configuration management.
That said, requirements.txt
can be run in an idempotent manner, however
a few things need to be highlighted:
- A first time execution of
bin/"pip${PYTHON_MAJOR_VERSION}" install -r /opt/skyline/github/skyline/requirements.txt
will timeout on configuration management. Therefore consider running this manually first. Once pip has installed all the packages, therequirements.txt
will run idempotent with no issue and be used to upgrade via a configuration management run when therequirements.txt
is updated with any new versions of packages (with the possible exception of pandas). It is obviously possible to provision each requirement individually directly in configuration management and not use pip toinstall -r
therequirements.txt
, however remember the the virtualenv pip needs to be used and pandas needs a LONG timeout value, which not all package classes provide, if you use an exec of any sort, ensure the pandas install has a long timeout.