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Ralsina.Me — Roberto Alsina's website

En que ando? (19/7/22)

Es­to es una es­pe­cie de se­cue­la a Lo que an­do ha­cien­do de ha­ce un me­s.

Si­go ha­cien­do lo mis­mo? Ma­so. Arran­que­mos con qué pa­só con lo que es­ta­ba ha­cien­do.

Lo que estaba haciendo antes

Compu Artesanal

Hi­ce co­sas, pe­ro de­ci­dí cam­biar la CPU por una Ra­d­xa Ze­ro ... que no an­da con mi mo­ni­to­r, así que me creé un su­bpro­yec­to de "ha­cer que an­de".

Software configurado para pantallas raras/malas

Ter­mi­na­do, por lo me­nos a un ni­vel de co­mo­di­dad su­fi­cien­te. So­lo fal­ta pu­bli­car de al­gu­na ma­ne­ra.

Software que creo que nadie usa, pero debieran!

No vol­ví a usar nin­gu­na de las co­sas que men­cio­né :-D

Sin em­bar­go, acá es­tá el so­ftwa­re que na­die usa pe­ro de­bie­ran, de es­te me­s.

  • dolt una ba­se de da­tos com­pa­ti­ble con MyS­QL pe­ro que vis­ta de otra ma­ne­ra es ... co­mo gi­t?

La per­for­man­ce es me­dio fa­lo­pa pe­ro es muy pio­la pa­ra pu­bli­car da­to­s. Ejem­plo.

  • rq­­li­­te la res­­pues­­ta a "Ne­­ce­­si­­to usar sq­­li­­te pe­­ro no quie­­ro mo­­­ver un ar­­chi­­vo de da­­tos de un la­­do pa­­ra otro"

  • st una te­r­­mi­­nal su­­per li­­via­­na que no es una ba­­zo­­­fia! Ten­­go un fo­­­rk

El Mouse-Joystick

Aban­do­na­do (o ter­mi­na­do, que es lo mis­mo­).

Programar Raspberry Pi Pico

No mu­cho

Lo que estoy haciendo ahora

Nuevo server

Mi­gré mi ser­ver a una Ra­d­xa Ze­ro una com­pu que tie­ne per­for­man­ce ti­po ras­pi 4, pe­ro en un for­ma­to fí­si­co ti­po ras­pi ze­ro.

Al te­ner más ca­pa­ci­dad de cóm­pu­to y me­mo­ria, le me­tí mas ser­vi­cio­s!

Mo­ví to­do http://­nom­bres.­ral­si­na.­me pa­ra que se eje­cu­te ahí. Eso im­pli­ca una ba­se de da­tos (r­q­li­te) y un en­torno de eje­cu­ción es­pe­cia­l, por­que no quie­ro que si de gol­pe la gen­te lo usa me ti­re aba­jo los otros ser­vi­cio­s. Por eso ...

Firecracker + Ignite + Faasd

Quie­ro po­der pu­bli­car bo­lu­de­ces he­chas rá­pi­do en Py­thon (o en otros len­gua­je­s) sin te­ner que pen­sar en có­mo ha­cer el de­plo­y­men­t, o de si a mi ser­ver no le va a dar el cue­ro y me va a ti­rar al­go "im­por­tan­te", o de pro­ble­mas de se­gu­ri­da­d, etc.

En­ton­ce­s:

  • Pa­ra de­plo­year fá­ci­l: faasd
  • Pa­ra ais­lar­lo den­tro del ser­ve­r: ig­ni­te
  • Pa­ra te­ner ba­se de da­tos pa­ra bo­lu­dea­r: rq­li­te

De esa ma­ne­ra tie­ne un to­pe en cuan­to a con­su­mo de re­cur­so­s, y pue­do de­plo­year sim­ple­men­te con un co­man­do.

Impresión y Diseño 3D

Si quie­ro ha­cer una no­te­book, ob­via­men­te eso im­pli­ca di­se­ñar la car­ca­za y un mon­tón de otras co­sas, por lo que he te­ni­do que apren­der so­bre co­mo ha­cer esas co­sas.

He usa­do una va­rie­dad de he­rra­mien­tas y es­toy MUY FE­LIZ con una que se lla­ma Ca­d­Que­ry que per­mi­te crear ob­je­tos es­cri­bien­do Py­tho­n!

He lle­ga­do al mo­men­to en que me sien­to có­mo­do, cuan­do no ten­go el ob­je­to que ne­ce­si­to, o ten­go par­tes y me fal­tan otra­s, sim­ple­men­te de de­cir "o­k, la ha­go yo­".

Datos sobre nombres de Argentina

Ha­ce unos años pu­bli­qué una "a­pp" en http://­nom­bres.­ral­si­na.­me pa­ra ju­gar con la ba­se de da­tos ofi­cial de nom­bres de Ar­gen­ti­na. El RE­NA­PER ha­bía pu­bli­ca­do la lis­ta de nom­bres de pi­la y canti­dad de gen­te con ese nom­bre en ca­da año des­de 1922 has­ta 2015 y da­ba pa­ra ha­cer una co­si­ta di­ver­ti­da cu­yo uso prin­ci­pal ha si­do ha­cer­me el gra­cio­so en twi­tte­r.

Esos da­tos los sa­qué de acá y se usa­ban en es­ta pá­gi­na ... que ya no an­da

Pe­ro ... los da­tos es­tán pu­bli­ca­dos co­mo CS­V, y la ca­li­dad es muy ma­la, y pa­ra po­der usar­los hay que im­por­tar­los en una ba­se, y ha­cer bús­que­das cuan­do la or­to­gra­fía de los nom­bres es va­ria­ble es un lío y ...

Así que de­ci­dí pu­bli­car mi ba­se "lim­pia" en al­gu­na par­te, y ya que es­ta­mos tam­bién una co­pia de los da­tos ori­gi­na­le­s, pe­ro en una ba­se SQL que se pue­da usar di­rec­to.

Bus­can­do co­mo ha­cer­lo en­contré Dol­tHub que es "co­mo Gi­tHub pe­ro pa­ra da­to­s" así que de­ci­dí usar­lo.

Sin más pro­le­gó­me­no­s: http­s://www.­dol­thu­b.­co­m/­re­po­si­to­rie­s/­ral­si­na/­nom­bres_ar­gen­ti­na_1922_2005/­da­ta/­main

Gra­cias al RE­NA­PER por pu­bli­car es­tos da­tos con una li­cen­cia que me per­mi­te ha­cer­lo.

My Backup Solution

Intro

Back­ups are im­por­tant ok? I know that. You should know that. So, why don't most peo­ple do prop­er back­ups of their com­put­er­s?

Be­cause most of the ways to do back­ups are ei­ther in­con­ve­nient or use­less.

So, here's how the so­lu­tion I have im­ple­ment­ed that makes back­ups con­ve­nient and use­ful.

The backup tool itself

I use restic be­cause it kicks as­s. It work­s, it's fast, it's space ef­fi­cien­t, and it's easy.

You just need to write a short script like this one:

#!/bin/bash -x

# Where to backup?
MOUNTDIR=/backup
BACKUPDIR=$MOUNTDIR/backup-$HOSTNAME

if [ -d $BACKUPDIR ]
then
    # Backups are password protected
    export RESTIC_PASSWORD=passwordgoeshere

    # What to backup
    restic -r $BACKUPDIR --verbose backup \
            /home/ralsina \
            --exclude ~ralsina/.cargo \
            --exclude ~ralsina/.local/share/Steam/ \
            --exclude ~ralsina/.cache \
            --exclude ~ralsina/.config/google-chrome/ \
            --exclude ~ralsina/.rustup \
            --exclude ~ralsina/.npm \
            --exclude ~ralsina/.gitbook \
            \
            /etc/systemd/system/backup.* \
            /usr/local/bin

    # Keep at most one backup for the last 7 days that have backups
    restic -r $MOUNTDIR/backup-pinky forget --prune --keep-daily=7
    # Cleanup
    restic -r $MOUNTDIR/backup-pinky prune
    # Make really sure things are stored
    sync; sync; sync; sync
fi

Backup rule 3-2-1

The 3-2-1 rule:

  • 3 copies of the back­up da­ta (1 pri­ma­ry, 2 copies)
  • 2 dif­fer­ent me­dia
  • 1 must be off­site

In my case, these are:

  • Pri­ma­ry back­up is to disk
  • Sec­ondary back­up is to a disk in an­oth­er ma­chine (sim­i­lar scrip­t, us­ing sftp)
  • Ter­tiary back­up is to a pen drive (d­if­fer­ent me­di­a) I then put in my pock­et (off­site).

To per­form the pri­ma­ry and sec­ondary back­up­s, it's just two slight­ly dif­fer­ent ver­sions of that script (ac­tu­al­ly, it's just one script with ar­gu­ments, left as an ex­er­cise for the read­er).

The ter­tiary back­up is a bit more com­pli­cat­ed, be­cause I want­ed it to be con­ve­nient

The Convenient Way To Backup to a Removable Drive

My us­er sto­ry was this:

As a per­son that needs an off­site back­up but don't want to trans­mit all that data, I want to plug a pen drive in­to the ma­chine and have it AU­TO­MAT­I­CAL­LY start back­ing the da­ta in­to the pen drive.

Then, once the back­up is fin­ished, at some point, I can just un­plug it and take it with me.

Let's just say that find­ing a way that works took me a few hours and I am pret­ty sure my so­lu­tion is more com­pli­cat­ed than it needs to be. But hey, it work­s, so it's good enough.

This be­ing Lin­ux and the year be­ing 2022 ... this so­lu­tion in­volves sys­temd. And be­cause it's sys­temd, it's com­pli­cat­ed.

Automount

First part is we need to mount the pen drive automatically in a well known location. For this we need two things. An automount service, so systemd will automatically mount something in /backup:

/etc/systemd/system/backup.automount

[Unit]
Description=Automount Backup

[Automount]
Where=/backup
TimeoutIdleSec=5min

[Install]
WantedBy=multi-user.target

And a mount service so it knows what to mount in /backup and how:

/etc/systemd/system/backup.mount

[Unit]
Description=Backup
Wants=backup.service
Before=backup.service

[Mount]
What=/dev/disk/by-uuid/74cac511-4d7a-4221-9c0f-e554de12fbf1
Where=/backup
Type=ext4
Options=auto

[Install]
WantedBy=multi-user.target

The in­ter­est­ing parts are:

  • Wants and Before: that backup.service is going to be a systemd service that actually runs the backup script. We want it to run, and to run AFTER the device is mounted.
  • Where and What: Where is the mountpoint, and What is the pen drive's UUID as shown by sudo blkid

En­able and start the au­to­mount ser­vice, no need to do any­thing to the mount one.

Then of course we need the back­up ser­vice it­self. Just a "oneshot". When it's start­ed, it runs the back­up scrip­t:

/etc/systemd/system/backup.service

[Unit]
Description=Backup
Requires=backup.mount
After=backup.mount

[Service]
Type=oneshot
ExecStart=/usr/local/bin/backup.sh

[Install]
WantedBy=multi-user.target

En­able but don't start this ser­vice. Since it's "Want­ed" by the moun­t, that means when the de­vice is ef­fec­tive­ly mount­ed the back­up will start.

OR THAT WOULD IT DO IF THINGS MADE SENSE.

Sadly, the device is only mounted when, after being inserted, something tries to use the mountpoint. So, with these three services installed nothing happens unless, after you plug the pen drive you go and do something like ls /backup, which triggers the mount, which triggers the backup script.

So, how does one fix that? No idea. My workaround was to add TWO MORE SERVICES, so that ls /backup runs every minute.

/etc/systemd/system/backup_try.timer

[Unit]
Description=Try to run backup

[Timer]
OnUnitActiveSec=1min

[Install]
WantedBy=timers.target

/etc/systemd/system/backup_try.service

[Unit]
Description=Trigger Backup

[Service]
Type=oneshot
ExecStart=/bin/ls /backup

[Install]
WantedBy=multi-user.target

And with that, yes, I can just plug the pen drive when I get to the of­fice in the morn­ing and un­plug it lat­er, know­ing there is a back­up in it.

Radxa Zero!

Lo qué?

Las Ras­pbe­rry Pi son úti­le­s, bue­nas y ba­ra­ta­s. Ex­cep­to por un de­ta­lle: es im­po­si­ble com­prar­la­s.

No hay sto­ck de Ras­pbe­rry PI 4, no hay sto­ck de Ras­pbe­rry Pi Ze­ro 2W, no hay sto­ck de na­da, ex­cep­to Pi Pi­co (que son mi­cro­con­tro­la­do­res) y Pi 400 (que no son lo que quie­ro­).

En­ton­ces bus­qué al­ter­na­ti­va­s, y en­contré la bue­na gen­te de All­net Chi­na que ven­de la lí­nea Ro­ck Pi.

¿Cómo son las Rock Pi?

  • Son ... pa­re­ci­das a las Ras­pbe­rry
  • En har­dwa­re, en al­gu­nos ca­so­s, son me­jo­res!
  • En so­ftwa­re ... es­tán un po­co más cru­da­s.
  • En com­pa­ti­bi­li­dad son más com­pli­ca­da­s.

Pe­ro ... HAY STO­CK y A BUEN PRE­CIO y MAN­DAN A AR­GEN­TI­NA!

Así que me com­pre un par de Ra­d­xa Ze­ro­s. Son co­mo una Pi Ze­ro ... pe­ro la CPU es mas o me­nos co­mo la de una Pi 4????

Tu­ve un pro­ble­mi­ta ini­cial­men­te pa­ra pa­gar­lo pe­ro me lo re­sol­vie­ron de in­me­dia­to y me upgra­dea­ron el shi­pping a Fe­dEx, así que lle­ga­ron en dos se­ma­nas y no pa­gué adua­na.

Eso sí, Fe­dEx no te avi­sa que cuan­do te lo traen te van a co­brar "al­go­", y no te di­cen cuán­to ni que te­nés que pa­gar cas­h.

En mi ca­so fue­ron $5400 y no me avi­sa­ron a tiem­po asi que tu­ve que es­pe­rar un día ex­tra.

Y qué tal andan?

Her­mo­so. La CPU es rá­pi­da. Man­ja­ro an­da 10 pun­tos (u­na vez que en­ten­dí co­mo ins­ta­lar­lo­).

Tie­ne eM­MC así que no ne­ce­si­ta tar­je­ta SD!

Un pro­ble­ma es que no he po­di­do ha­cer an­dar mi dis­play 1920­x480 (hay so­lo una men­ción de otra per­so­na en la In­ter­net in­ten­tán­do­lo, tam­po­co le an­du­vo)

Sal­vo eso? Ex­ce­len­te.

Es­toy mi­gran­do mi ser­ver Pi­nky a una Ra­d­xa, ya que la ten­go y con­su­me lo mis­mo que la Pi 3

Si bien leí va­rias ad­ver­ten­cias so­bre que se pue­den re­ca­len­tar no pa­re­cen pa­sar de los 48 gra­dos en uso nor­ma­l.

En ge­ne­ra­l, las re­co­mien­do, pe­ro ca­da uno ten­drá que ver cuán­to quie­re gas­tar y pa­ra qué.

The cases I built for my mini servers

I have writ­ten a cou­ple posts about my rasp­ber­ry-pi home server­s. And peo­ple seem to like the cas­es I 3d-print­ed for them.

Well, if you liked them here they are.

For a Rasp­ber­ry pi 3-based serv­er you need:

  • The case it­self
  • Caps to lock each disk in its slot: 1 and 2
  • Cap to lock the pi in its slot

For a Rasp­ber­ry pi 4-based serv­er you need:

  • The case it­self
  • Caps to lock each disk in its slot: 1 and 2
  • Cap to lock the pi in its slot

All these are just the fol­low­ing de­signs from thin­gi­verse slapped to­geth­er:

  • Pi 3 sleeve case: here
  • Pi 4 sleeve case: here
  • HDD case: here

They work bet­ter (or at al­l!) if you use a pow­ered USB hub. There is no room in the case for it, just buy one you like and glue it to the side :-)

Case with a USB server glued to it


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