<s>
Travis	B-Application
CI	I-Application
is	O
a	O
hosted	O
continuous	O
integration	O
service	O
used	O
to	O
build	O
and	O
test	O
software	O
projects	O
hosted	O
on	O
GitHub	B-Application
,	O
Bitbucket	B-Protocol
,	O
GitLab	B-Application
,	O
Perforce	B-General_Concept
,	O
Apache	B-Application
Subversion	I-Application
and	O
Assembla	B-Protocol
.	O
</s>
<s>
Travis	B-Application
CI	I-Application
was	O
the	O
first	O
CI	O
service	O
that	O
provided	O
services	O
to	O
open-source	O
projects	O
for	O
free	O
and	O
continues	O
to	O
do	O
so	O
.	O
</s>
<s>
The	O
source	O
is	O
technically	O
free	B-Application
software	I-Application
and	O
available	O
piecemeal	O
on	O
GitHub	B-Application
under	O
permissive	O
licenses	O
.	O
</s>
<s>
Travis	B-Application
CI	I-Application
is	O
configured	O
by	O
adding	O
a	O
file	B-Operating_System
named	O
.travis.yml	O
,	O
which	O
is	O
a	O
YAML	B-Protocol
format	O
text	O
file	B-Operating_System
,	O
to	O
the	O
root	O
directory	O
of	O
the	O
repository	O
.	O
</s>
<s>
This	O
file	B-Operating_System
specifies	O
the	O
programming	O
language	O
used	O
,	O
the	O
desired	O
building	O
and	O
testing	O
environment	O
(	O
including	O
dependencies	O
which	O
must	O
be	O
installed	O
before	O
the	O
software	O
can	O
be	O
built	O
and	O
tested	O
)	O
,	O
and	O
various	O
other	O
parameters	O
.	O
</s>
<s>
The	O
default	O
CPU	O
architecture	O
used	O
in	O
Travis	B-Application
CI	I-Application
builds	O
is	O
amd64	O
.	O
</s>
<s>
It	O
is	O
possible	O
to	O
use	O
Docker	B-Language
in	O
multiple	O
CPU	O
architecture-based	O
builds	O
within	O
an	O
LXD	O
container	O
.	O
</s>
<s>
You	O
may	O
need	O
a	O
specific	O
CPU	O
architecture-compliant	O
Docker	B-Language
image	O
as	O
a	O
base	O
or	O
ensure	O
relevant	O
libraries	O
required	O
by	O
your	O
build	O
are	O
added	O
to	O
your	O
Dockerfile	B-Language
.	O
</s>
<s>
When	O
Travis	B-Application
CI	I-Application
has	O
been	O
activated	O
for	O
a	O
given	O
repository	O
,	O
GitHub	B-Application
will	O
notify	O
it	O
whenever	O
new	O
commits	O
are	O
pushed	O
to	O
that	O
repository	O
or	O
a	O
pull	O
request	O
is	O
submitted	O
.	O
</s>
<s>
Travis	B-Application
CI	I-Application
will	O
then	O
check	O
out	O
the	O
relevant	O
branch	B-General_Concept
and	O
run	O
the	O
commands	O
specified	O
in	O
.travis.yml	O
,	O
which	O
usually	O
builds	O
the	O
software	O
and	O
run	O
any	O
automated	O
tests	O
.	O
</s>
<s>
When	O
that	O
process	O
has	O
been	O
completed	O
,	O
Travis	O
notifies	O
the	O
developer(s )	O
in	O
the	O
way	O
it	O
has	O
been	O
configured	O
to	O
do	O
so	O
—	O
for	O
example	O
,	O
by	O
sending	O
an	O
email	O
containing	O
the	O
test	O
results	O
(	O
showing	O
success	O
or	O
failure	O
)	O
,	O
or	O
by	O
posting	O
a	O
message	O
on	O
an	O
IRC	B-Protocol
channel	O
.	O
</s>
<s>
In	O
the	O
case	O
of	O
pull	O
requests	O
,	O
the	O
pull	O
request	O
will	O
be	O
annotated	O
with	O
the	O
outcome	O
and	O
a	O
link	O
to	O
the	O
build	O
log	O
using	O
a	O
GitHub	B-Application
integration	O
.	O
</s>
<s>
Travis	B-Application
CI	I-Application
can	O
be	O
configured	O
to	O
run	O
the	O
tests	O
on	O
a	O
range	O
of	O
different	O
machines	O
with	O
different	O
software	O
installed	O
(	O
such	O
as	O
older	O
versions	O
of	O
a	O
programming	O
language	O
implementation	O
to	O
test	O
for	O
compatibility	O
)	O
.	O
</s>
<s>
The	O
Travis	B-Application
CI	I-Application
blog	O
is	O
mainly	O
run	O
by	O
Travis	O
's	O
Software	O
Engineer	O
,	O
Montana	O
Mendy	O
.	O
</s>
<s>
In	O
March	O
2019	O
,	O
Travis	B-Application
CI	I-Application
infrastructure	O
suffered	O
a	O
massive	O
outage	O
from	O
March	O
27	O
to	O
March	O
29	O
.	O
</s>
<s>
In	O
March	O
2020	O
,	O
Travis	B-Application
CI	I-Application
introduced	O
'	O
The	O
Cookbook	O
 '	O
written	O
by	O
Montana	O
Mendy	O
with	O
tutorials	O
for	O
common	O
use	O
cases	O
.	O
</s>
<s>
In	O
November	O
2020	O
,	O
Travis	B-Application
CI	I-Application
announced	O
the	O
shutdown	O
of	O
travis-ci.org	O
by	O
December	O
31	O
,	O
2020	O
,	O
with	O
all	O
existing	O
and	O
new	O
accounts	O
migrating	O
to	O
travis-ci.com	O
.	O
</s>
<s>
Despite	O
the	O
official	O
pledge	O
to	O
keep	O
"	O
open	O
source	O
accounts	O
completely	O
free	O
under	O
travis-ci.com	O
 "	O
,	O
open-source	O
projects	O
report	O
that	O
their	O
build	O
jobs	O
stalled	O
.	O
</s>
