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## Why not on github.com ## Why not on github.com
We love collaboration between people, and software developement can be a wonderful playground. Nevertheless, we are not comfortable with the social-neworkish nature of github, and also the choice of a platform is something that is meaningful in itself. We love collaboration between people, and software development can be
Fortunately go allows to pull packages from any git server that is publicly available. Therefore do not be afraid of go-getting from git.lattuga.net. a wonderful playground. Nevertheless, we are not comfortable with the
social-neworkish nature of github. Also, the choice of a platform is something
that is meaningful in itself. Fortunately `go` allows to pull packages from any
git server that is publicly available. Therefore do not be afraid of go-getting
from git.lattuga.net.
[Spiegare meglio la natura autogestita di lattuga] [Spiegare meglio la natura autogestita di lattuga]
### So how to collaborate ### So how to collaborate
If you want to collaborate to the software, either drop a mail to <indirizzo@scamuffo.com> or open an account on git.lattuga.net to open a PR. If you want to collaborate to the software, either drop a mail to
We are also reachable at [IRC irc.mufhd0.net] <indirizzo@scamuffo.com> or open an account on git.lattuga.net to open a PR. We
are also reachable at [IRC irc.mufhd0.net]

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# Circolog # Circolog
Circolog proposes a differnt approach to the problem of having useful logs. Circolog proposes a different approach to the problem of having useful logs.
Circolog is a syslog server which doesn't write to disk. Ever. It doesn't consume tons of RAM like elasticsearch/logstash, nor does it give you plots and a very long history. Circolog is a syslog server which doesn't write to disk. Ever. It doesn't
It is however a very useful tool when you want to minimize disk writes. We wrote it thinking about user privacy: your logs can be just as sensitive as your database if you log too much! consume tons of RAM like elasticsearch/logstash, nor does it give you plots and
a very long history. It is however a very useful tool when you want to minimize
disk writes. We wrote it thinking about user privacy: your logs can be just as
sensitive as your database if you log too much!
[Spiegone su casi d'uso, buttare i log, debuggare rapidamente magari applicazioni verbose, eccetera] [Spiegone su casi d'uso, buttare i log, debuggare rapidamente magari
applicazioni verbose, eccetera]
## Why it is cool in 2 minutes ## Why it is cool in 2 minutes
Keep your users safer - It keeps your users safer.
Read logs conveniently: - Read logs conveniently: filter with a proper (and easy) query language!
filter with a proper (and easy) query language! `grep` is powerful, but sometimes you want something more expressive:
grep is powerful, but sometimes you want something more expressive: ```
circolog-tail -where 'app_name=="apache" and message LIKE "%memory%"'
circolog-tail -where '(app_name"apache" OR app_name LIKE "php%") AND message LIKE "%memory%"'
circolog-tail -where 'app_name=="mysql" OR severity >= warning'
```
circolog-tail -where 'app_name=="apache" and message LIKE "%memory%"' - Colors: highlight severity and visually group related message
circolog-tail -where '(app_name"apache" OR app_name LIKE "php%") AND message LIKE "%memory%"' [screenshot]
circolog-tail -where 'app_name=="mysql" OR severity >= warning' It's not only about being nice, we swear! Coloring logs also means reaching the
most important entries easily, and grouping related entries together. Output
colors to highlight high severity and visually group related message logs in the format you prefer _now_. Depending on what you're doing, log format
might be useful... or distracting. For example, how many times have you used
[screenshot] the `hostname` part of it? With the common disk-based logging, you need to
choose once and for all how your logs will be saved.
It's not only about being nice, we swear! coloring logs also means reaching the most important entries easily, and grouping related entries together.
output logs in the format you prefer _now_ - Hackable: we think that `circolog-tail` is pretty cool, but you definitely can
reuse simpler tools to get logs and filter them the way you prefer. Clients
depending on what you're doing, log format might be useful... or distracting. For example, how many times have you used the `hostname` part of it? With the common disk-based logging, you need to choose once and for all how your logs will be saved. With circolog can read logs using plain HTTP (or websocket). Most of the cool features of
`circolog-tail` are actually implemented server-side, so you can use filters
(or other options) with any client.
Hackable - Fast, secure by default (?), easy to deploy. Those are features that you
should expect, not be surprised of! Circolog can easily process thousands
We think that circolog-tail is pretty cool, but you definitely can reuse simpler tools to get logs and filter them the way you prefer. clients can read logs using plain HTTP (or websocket). Most of the cool features of circolog-tail are actually implemented server-side, so you can use filters (or other options) wih any client. of log entries per seconds, has sane defaults and can be deployed as a single
binary.
Fast, secure by default (?), easy deploy
Those are features that you should expect, not be surprised of! circolog can easily process thousands of log entries per seconds, has sane defaults and can be deployed as a single binary
## Security considerations ## Security considerations
While we try our best not to introduce vulnerabilities, this software is not meant to be exposed on the wider internet. While we try our best not to introduce vulnerabilities, this software is not
Beware of binding it on something different from localhost. meant to be exposed on the wider internet. Beware of binding it on something
different from `localhost`.
Even without being exposed, care must be given to socket permissions: don't let unprivileged users read your logs! Even without being exposed, care must be given to socket permissions: don't let
We suggest that you use a dedicated user/group to run circolog, and make root part of that group. unprivileged users read your logs! We suggest that you use a dedicated
user/group to run circolog, and make root part of that group.

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## Installation and Configuration ## Installation and Configuration
If you trust us, just get the compiled binaries and copy them to /usr/local/{s,}bin/ (but you shouldn't: [compiling -> altra pagina]). If you trust us, just get the compiled binaries and copy them to
`/usr/local/{s,}bin/` (but you shouldn't: [TODO: compiling -> altra pagina]).
Running circologd is pretty easy: just run `circologd` by hand or in your favourite service manager: [here are some contrib scripts] for sysV, systemd, supervisor... but consider them as hints, don't just copy them! Running circolog is pretty easy: just run `circologd` by hand or in your
favourite service manager: here are some contrib scripts for SysV, systemd,
supervisor... but consider them as hints, don't just copy them!
[TODO: add scripts]
### System Integration ### System Integration
While circologd can be your only syslog daemon, you might want to couple it with another syslog to have the best of both worlds. For example, you could use rsyslog (or syslog-ng) to write important (ie: priority >= notice) log to persistent storage, letting circolog handle short-term but heavily detailed logs. While circologd can be your only syslog daemon, you might want to couple it
with another syslog to have the best of both worlds. For example, you could use
rsyslog (or syslog-ng) to write important (ie: `priority >= notice`) log to
persistent storage, letting circolog handle short-term but heavily detailed
logs.
Or you could make circolog get messages from journald. While possibilities are endless, we tried to document some common setups. Or you could make circolog get messages from `journald`. While possibilities are
endless, we tried to document some common setups.
#### Use Case: circologd as the only syslog #### Use Case: circologd as the only syslog
[mica lo so se funziona, credo di no, ma proviamo] [mica lo so se funziona, credo di no, ma proviamo] bind it to `/dev/log`.
bind it to /dev/log
#### Use Case: circologd receiving messages from syslog-ng #### Use Case: circologd receiving messages from syslog-ng
#### Use Case: circologd receiving messages from journald #### Use Case: circologd receiving messages from journald
[TODO: il codice va ancora scritto: bisogna bindare /run/systemd/journal/syslog con formato != rfc5424 [TODO: il codice va ancora scritto: bisogna bindare /run/systemd/journal/syslog
con formato != rfc5424]

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Query language Query language
=================== ==============
circolog uses a sql-inspired query language. If you know SQL, then you can use "where clauses" in circolog. If Circolog uses a sql-inspired query language. If you know SQL, then you can use
you don't know SQL, don't worry: the language is easy enough for you to learn the most basic queries without "where clauses" in circolog. If you don't know SQL, don't worry: the language
worrying too much. is easy enough for you to learn the most basic queries without worrying too
much.
You can only filter the rows, you can't sort them or group them in any way. You can only filter the rows, you can't sort them or group them in any way.
Reference Reference
----------- ---------
Available fields: Available fields:
- `message`: the string with the main information - `message`: the string with the main information
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- `severity`: an integer describing severity - `severity`: an integer describing severity
Examples
--------
TODO