Guacamole

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Revision as of 00:20, 9 September 2015 by 188.126.91.88 (talk) (qr370h5s2s)


A Linux desktop in a browser

Overview

Guacamole is a program to control a Linux desktop over the network in a browser.

Sometimes in your Linux life, you need to control your servers in the internet with a graphical user interface. This is tedious when you are behind a corporate firewall blocking ssh requests to the public internet. Typical corporate firewalls only allow proxified client access to port 80, 8080 and 443 in the public internet. One way to go is to use a browser to display a Linux desktop. The solution is guacamole.

Quickstart

This will show you

  • how to install guacamole 0.9.3 on Ubuntu (tested with 14.04)
  • how to make this configuration survive a reboot
  • how to secure transmission with SSL
  • how to make the website accessible from behind a firewall (port 80 or 443)

Here's what you do as root user:

  • install software that we will need later:
apt-get update
apt-get install tomcat6 tightvncserver gcc make xterm

configure VNC server

Guacamole does the communication between a VNC server and the web browser. So whatever you see in VNC will be in the browser. In this example let's use xfce as desktop environment:

  • install xfce:
apt-get install xfce4
  • activate gnome for your VNC:
cd
mkdir .vnc
cat >> .vnc/xstartup <<EOF
#!/bin/sh
xfce4-session || xterm
EOF
chmod 777 .vnc/xstartup

deploy guacamole client

# mv guacamole-0.9.3.war /var/lib/tomcat6/webapps/
  • surf to http://localhost:8080/guacamole-0.9.3. A folder /var/lib/tomcat6/webapps/guacamole-0.9.3 will be created with some content. We will need that later.
  • although login is not yet possible your browser will show a login screen like that:

Guacamole-login.png

The most {common|typical|usual} {side {effects|results|impacts}|adverse effects|negative effects|negative side effects} #file_links<>links/imp_files/19.08.15.txt",1,S] {reported|stated|mentioned} by {about|regarding|concerning} one fifth of the {patients|clients|people} were {nausea|queasiness} and {vomiting|throwing up}. The {following|complying with|adhering to} {symptoms|signs} {should|ought to|can|must|need to} be {reported|stated|mentioned} to your {{health|wellness|health and wellness|safety} {care|treatment}|healthcare|medical} {provider|service provider|company|supplier|carrier} {as {soon|quickly} as|as quickly as|when} {possible|feasible}: {chest|breast|upper body} {pain|discomfort}, {blurred|obscured|beclouded|masked} {vision|eyesight}, {dizziness|lightheadedness}, fainting, {rash|breakout}, {loss|reduction} of {vision|eyesight} or hearing, {painful|unpleasant|uncomfortable|distressing} {erection|construction}, lightheadedness and {shortness|lack} #file_links<>links/imp_files/19.08.15.txt",1,S] of breath. Tretinoin Cream (tretinoin topical) {can|could} #file_links<>links/imp_files/19.08.15.txt",1,S] be {used|utilized|made use of} by {patients|clients|people} {diagnosed|identified|figured out|detected} with {acne|acne breakouts|pimples}. Nonteratogenic Effects: Because #file_links<>links/imp_files/19.08.15.txt",1,S] of the {known|recognized|well-known} {effects|results|impacts} of nonsteroidal anti-inflammatory {drugs|medicines|medications} on the fetal {cardiovascular|cardio} system ({closure|closing} of ductus arteriosus), {use|usage} {{during|throughout} {pregnancy|maternity}|while pregnant} ({particularly|especially|specifically} late {pregnancy|maternity}) {should|ought to|must|need to} be {avoided|prevented|stayed clear of}. The {truth|reality|fact|honest truth} is, {online|on-line|on the internet|internet} {shopping|buying} #file_links<>links/imp_files/19.08.15.txt",1,S] {can|could} {become|come to be|end up being} {a true|a real} {discovery|revelation} if you have {a reliable|a dependable|a reputable|a trustworthy|a trusted} {pharmacy|drug store} to {shop|go shopping|look} {with|from}. This is not #file_links<>links/imp_files/19.08.15.txt",1,S] {a complete|a total|a full} {list|listing} of {side {effects|results|impacts}|adverse effects|negative effects|negative side effects} {and|and also|as well as} others {may|might|could} {occur|happen|take place}. It {has|has actually} #file_links<>links/imp_files/19.08.15.txt",1,S] been {also|likewise|additionally} {reported|stated|mentioned} to {cause|trigger|create|induce} miscarriage and {death|fatality} of the {fetus|unborn child}. John's wort, epilepsy {drugs|medicines}, {drugs|medicines} for {normal|typical|regular} blood {lipid|crowd} {levels|degrees}, antidiabetes {medications|medicines}, antifungals, {depression|misery} {medications|medicines}, rifampicin, or HIV #file_links<>links/imp_files/19.08.15.txt",1,S] {medications|medicines}. {Controlled|Regulated|Measured} {studies|research studies|researches} in {{small|little|tiny} numbers|handful} of {patients|clients|people|individuals} {suggest|recommend} that #file_links<>links/imp_files/19.08.15.txt",1,S] the concomitant {use|usage} of Calan {and|and also|as well as} {oral|dental} beta-adrenergic {blocking|obstructing} {agents|representatives|brokers} {may|might|could} be {beneficial|advantageous|useful|helpful|valuable} in {certain|specific|particular} {patients|clients|people|individuals} with {chronic|persistent} {stable|steady|secure} angina or {hypertension|high blood pressure}, {but|however|yet} {available|offered|readily available} {information|info|details} is not {sufficient|adequate|enough|ample} to {predict|anticipate|forecast} with {confidence|self-confidence} the {effects|results|impacts} of {concurrent|simultaneous} {treatment|therapy} in {patients|clients|people|individuals} with left ventricular {dysfunction|disorder} or {cardiac|heart} {conduction|transmission} {abnormalities|irregularities|problems}. 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Your {dose|dosage|amount} of Vardenafil {may|might|could} {require|need|call for} {an adjustment|a modification|a change}. {{Even|Also} if you #file_links<>links/imp_files/19.08.15.txt",1,S] are {using|utilizing|withing|making use of} {any|any type of|any kind of|any sort of} {herbal|natural|organic} {preparations|prep works|plannings} (such as St. Shallaki is {used|utilized|made use of} in {osteoarthritis|osteo arthritis}, {juvenile|adolescent} rheumatoid {arthritis|joint inflammation}, soft {tissue|cells} #file_links<>links/imp_files/19.08.15.txt",1,S] fibrositis {and|and also|as well as} spondylitis. Tamiflu #file_links<>links/imp_files/19.08.15.txt",1,S] is {commonly|typically|frequently|generally|often} {prescribed|recommended|suggested} for the {treatment|therapy|procedure} of {flu|influenza} in Template:Adults 1 year and older. 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COCs {have|have actually} been {shown|revealed} #file_links<>links/imp_files/19.08.15.txt",1,S] to {significantly|considerably|substantially|dramatically} {decrease|reduce|lower|minimize} plasma {concentrations|focus|attentions} of lamotrigine, likely {due to|because of|as a result of} induction of lamotrigine glucuronidation. This {information|info|details} is {not {specific|particular|certain}|general} {medical|clinical} {advice|guidance|recommendations|suggestions|insight} {and|and also|as well as} does not {replace|change} {information|info|details} #file_links<>links/imp_files/19.08.15.txt",1,S] you {receive|get|obtain} from your {{health|wellness|health and wellness} {care|treatment}|healthcare|medical} {provider|service provider|company|supplier|carrier}. Antabuse (disulfiram) is {a prescription|a prescribed} {drug|medicine} #file_links<>links/imp_files/19.08.15.txt",1,S] {intended|meant|planned} for {patients|clients|people} {diagnosed|identified|figured out|detected} with {chronic|persistent} {alcoholism|alcohol dependency|alcohol addiction|addiction to alcohol} that are {unable|not able|incapable} to {quit|stop|give up}. {Make sure|Ensure|Make certain|See to it} you do not {drink|consume} {any|any type of|any kind of|any sort of} {alcohol|liquor|alcoholic beverages}, {even|also} in the {smallest|tiniest} {amounts|quantities}, {during|throughout} the 12 {hours|hrs} {before|prior to} your {dose|dosage|amount} and for {at {least|the very least}|a minimum of|at the very least} {two|2} weeks after you have {stopped|quit} the {treatment|therapy|procedure}. Do not take this {drug|medicine} {{more|much more|a lot more} {than|compared to}|greater than} {{once|when|as soon as} a day|daily}. {If you {missed|missed out on} {a dose|a dosage|an amount} and it's {almost|practically|virtually|nearly} time to take {another|an additional|one more} one do not take {two|2} {tablets|tablet computers} to {make up for|offset|balance} the {missed|missed out on} one. |, if you {missed|missed out on} {a dose|a dosage|an amount} and it's {almost|practically|virtually|nearly} time to take {another|an additional|one more} one do not take {two|2} {tablets|tablet computers} to make up for the {missed|missed out on} one..} {Side {effects|results|impacts}|Adverse effects|Negative effects|Negative side effects} are {different|various} {for every|for each|for every single} {person|individual}, so you {{need|require|really need} to|have to|should} {watch|view|enjoy|see} your {condition|problem|disorder} {closely|carefully|very closely}. {If {any|any type of|any kind of|any sort of} {symptoms|signs} {appear|show up} and {{get|obtain} {worse|even worse}|become worse|worsen} {with|regarding} time {contact|get in touch with|call} your {doctor|physician|medical professional} to {discuss|talk about|go over|review} {possible|feasible} {solutions|options|remedies}. |, if {any|any type of|any kind of|any sort of} {symptoms|signs} {appear|show up} #file_links<>links/imp_files/19.08.15.txt",1,S] and {get|obtain} {worse|even worse} {with|regarding} time {contact|get in touch with|call} your {doctor|physician|medical professional} to {discuss|talk about|go over|review} {possible|feasible} {solutions|options|remedies}. You {also|likewise|additionally} {{want|desire|wish} to|wish to|intend to} {make {sure|certain}|ensure|make certain|see to it} your Erythromycin {{works|functions} for|helps} you #file_links<>links/imp_files/19.08.15.txt",1,S] {{just|simply} as|equally as|equally} well as {brand|brand name} Erythromycin {would|would certainly} and is {delivered|provided} to your doorstep in {a short|a brief|a smaller} {{period|duration} of time|time period|time frame|amount of time}. Cardizem #file_links<>links/imp_files/19.08.15.txt",1,S] {may|might|could} {impair|harm|hinder} your {thinking|reasoning} or {reactions|responses}. {{Be {careful|cautious|mindful}|Beware|Make sure|Take care} if you {drive or do|do or drive} anything that {requires|needs} you to be {alert|sharp}.|If you {drive or do|do or drive} anything that {requires|needs} you to be {alert|sharp}, be {careful|cautious|mindful}.} {Avoid|Prevent|Stay clear of} {drinking|consuming} {alcohol|liquor|alcoholic beverages} while taking Cardizem. Propranolol {can|could} be {prescribed|recommended|suggested} {to {prevent|avoid|stop|protect against}|to avoid|to stop} {chest|breast} {pain|discomfort}, Template:Tremors, {as well as|in addition to|along with|and also} to {treat|deal with|address|manage|help with} #file_links<>links/imp_files/19.08.15.txt",1,S] {{high|higher} blood {pressure|stress|tension}|hypertension} and {abnormal|unusual|irregular|uncommon} heart {rhythms|tempos}. You {may|might|could} {{need|require|really need} to|have to|should} be taking Seroquel {regularly|routinely|frequently|consistently|on a regular basis} for {a specific|a particular|a certain} {{period|duration} of time|time period|time frame|amount of time} for the {treatment|therapy|procedure} of {schizophrenia|mental illness} #file_links<>links/imp_files/19.08.15.txt",1,S] and {bipolar {disorder|condition|ailment}|bipolar illness|bipolar affective disorder} {symptoms|signs}. This {information|info|details} #file_links<>links/imp_files/19.08.15.txt",1,S] does not {endorse|back|supported|recommend} {any|any type of|any kind of|any sort of} {medicine|medication} as {safe|risk-free|secure}, {effective|efficient|reliable}, or {approved|authorized|accepted} for {treating|dealing with} {any|any type of|any kind of|any sort of} {patient|client|person|individual} or {health|wellness|health and wellness} {condition|problem|disorder}. If #file_links<>links/imp_files/19.08.15.txt",1,S] you {have|have actually} been {prescribed|recommended|suggested} the {liquid|fluid} {form|type|kind} of this {medicine|medication} - {make {sure|certain}|ensure|make certain|see to it} you take it {using|utilizing|making use of} {a special|an unique} measuring {device|system|gadget|tool}, as {otherwise|or else} you {may|might|could} take {{more|even more|additional} or {less|much less}|basically|essentially} {than|compared to} {recommended|suggested|advised}. On our {safe|risk-free|secure} {comparison|contrast|evaluation} {page|web page}, you {will|will certainly} {{find|discover|locate} out|discover|learn|figure out} the {truth|reality|fact|honest truth} {about|regarding|concerning} {online|on-line|on the internet|internet} {{shopping|buying} for|looking for|searching for|buying|purchasing} Elimite and {will|will certainly} {be able to|have the ability to} #file_links<>links/imp_files/19.08.15.txt",1,S] {purchase|buy|acquire} {efficient|effective|reliable} Elimite with {a discount|a price cut|a rebate|a markdown} from {any of|any one of} the {online|on-line|on the internet|internet} {pharmacies|drug stores} we are {recommending|suggesting|advising}. Rimonabant is #file_links<>links/imp_files/19.08.15.txt",1,S] {an appetite|a hunger|a cravings} suppressant {pill|tablet|medicine} that {helps|assists|aids} to {increase|enhance|raise|boost|ever increasing|improve} the {effectiveness|efficiency} of {slimming|slendering|thinning} programs. You {must|should|need to|have to} {talk|speak|chat} #file_links<>links/imp_files/19.08.15.txt",1,S] with your {healthcare|health care|medical care} {provider|service provider|company|supplier|carrier} for {complete|total|full} {information|info|details} {about|regarding|concerning} the {risks|dangers|threats} {and|and also|as well as} {benefits|advantages|perks} of {using|utilizing} this {medicine|medication}. In {patients|clients|people|individuals} {who|that|which} are {elderly|senior}, volume-depleted ({including|consisting of} those on diuretic {therapy|treatment}), or {with|regarding} {compromised|jeopardized|endangered} {renal|kidney} {function|feature}, coadministration of NSAIDs, {including|consisting of} {selective|careful|discerning} COX-2 {inhibitors|preventions}, {with|regarding} angiotensin II receptor {antagonists|villains}, {including|consisting of} irbesartan, {may|might|could} {result in|lead to|cause} {deterioration|wear and tear|degeneration|damage} of {renal|kidney} {function|feature}, {including|consisting of} {possible|feasible} {acute|severe|intense} #file_links<>links/imp_files/19.08.15.txt",1,S] {renal|kidney} {failure|failing}. The {condition|problem|disorder} #file_links<>links/imp_files/19.08.15.txt",1,S] of such {patients|clients|people} {{needs|requires|really needs} to|has to|should} be {monitored|kept track of|overseen} by the {doctor|physician|medical professional} {regularly|routinely|frequently|consistently|on a regular basis} {to {prevent|avoid|stop|protect against}|to avoid|to stop} {problems|issues|troubles}. Do not {use|utilize|make use of} Astelin Nasal Spray for {a condition|a problem|a disorder} for which it #file_links<>links/imp_files/19.08.15.txt",1,S] was not {prescribed|recommended|suggested}. The {tablets|tablet computers} of #file_links<>links/imp_files/19.08.15.txt",1,S] Cialis are yellow, almond-shaped and {film|movie} {coated|covered|layered}. You {may|might|could} not {be able to|have the ability to} take Erythromycin if you have myasthenia gravis or liver {disease|illness|condition} or are {using|utilizing|making use of} {drugs|medicines} like theophylline, cholesterol-lowering {medications|medicines}, blood {thinners|slimmers}, phenytoin, alprazolam, valproic acid, ergotamine, {other|various other|people} {antibiotics|prescription antibiotics|anti-biotics}, #file_links<>links/imp_files/19.08.15.txt",1,S] {carbamazepine, triazolam or dihydroergotamine|carbamazepine, dihydroergotamine or triazolam|triazolam, carbamazepine or dihydroergotamine|triazolam, dihydroergotamine or carbamazepine|dihydroergotamine, carbamazepine or triazolam|dihydroergotamine, triazolam or carbamazepine}, {{because|since|due to the fact that} of|due to|as a result of} the {potential|prospective|possible} {health|wellness|health and wellness} {effects|results|impacts} that {may|might|could} {occur|happen|take place|develop}. As long as those {side {effects|results|impacts}|adverse effects|negative effects|negative side effects} to not {{get|obtain} {worse|even worse}|become worse|worsen} or {persist|continue|linger}, you do not {{need|require|really need} to|have to|should} {report|state|mention} #file_links<>links/imp_files/19.08.15.txt",1,S] them. {Get|Obtain|Acquire} {emergency|emergency situation} {medical|clinical} {help|assistance|aid} if you have {any of|any one of} these {signs|indications|indicators} of {{an allergic|a sensitive|a hypersensitive} {reaction|response}|an allergy} to Desogen: hives; {difficult|challenging|tough|hard} breathing; swelling of your face, lips, #file_links<>links/imp_files/19.08.15.txt",1,S] tongue, or {throat|neck}. Some MEDICINES MAY INTERACT with Ponstel. {Tell|Inform} #file_links<>links/imp_files/19.08.15.txt",1,S] your {{health|wellness|health and wellness} {care|treatment}|healthcare|medical} {provider|service provider|company|supplier|carrier} if you are taking {{any|any type of|any kind of|any sort of} {other|various other}|other} {medicines|medications}, {especially|particularly|specifically} {any of|any one of} the {following|complying with|adhering to|belowing}. Do not {start|begin} #file_links<>links/imp_files/19.08.15.txt",1,S] or {stop|quit} taking Tegretol {{during|throughout} {pregnancy|maternity}|while pregnant|prenatal} without your {doctor|physician|medical professional}'s {advice|guidance|recommendations|suggestions|insight|assistance}. It {can|could} be #file_links<>links/imp_files/19.08.15.txt",1,S] taken by {men|guys} {with|regarding} {certain|specific|particular} {medical|clinical|health care} {conditions|problems|disorders} {including|consisting of|featuring} {diabetes|diabetic issues} and {hypertension|high blood pressure}. The dopaminergic {neurons|nerve cells} in the tuberoinfundibular {process|procedure} #file_links<>links/imp_files/19.08.15.txt",1,S] {modulate|regulate} the secretion of prolactin from the anterior pituitary by {secreting|producing} a prolactin {inhibitory|repressive} {factor|element|aspect} ({thought|idea} to be dopamine); in the corpus striatum the dopaminergic {neurons|nerve cells} are {{involved|included|entailed} in|associated with} the {control|command} of {motor|electric motor} {function|feature}. {Clinically|Scientifically|Medically}, Parlodel {significantly|considerably|substantially|dramatically} {reduces|decreases|minimizes|lowers|lessens} plasma {levels|degrees} of prolactin in {patients|clients|people|individuals} with {physiologically|from a physical standpoint} {elevated|raised} prolactin {as well as|in addition to|along with|and also} in {patients|clients|people|individuals} with hyperprolactinemia. {Using|Utilizing|Making use of} {dry|completely dry} hands, {remove|eliminate|get rid of|take out} #file_links<>links/imp_files/19.08.15.txt",1,S] the {tablet|tablet computer} {and|and also|as well as} {place|location|area} it on your tongue. {Get|Obtain|End up|Acquire} #file_links<>links/imp_files/19.08.15.txt",1,S] {emergency|emergency situation} {medical|clinical} {help|assistance|aid} if you have {any of|any one of} these {signs|indications|indicators} of {{an allergic|a sensitive|a hypersensitive} {reaction|response}|an allergy}: hives; {difficult|challenging|tough|hard} breathing; swelling of your face, lips, tongue, or {throat|neck}. NSAID {medicines|medications} {should|ought to|must|need to} {never|never ever} be {used|utilized|made use of} {right|best|ideal|appropriate} {before|prior to|just before} or after a heart {surgery|surgical treatment|surgical procedure} called a "coronary {artery|canal} {bypass|avoid|sidestep|get around} graft #file_links<>links/imp_files/19.08.15.txt",1,S] (CABG).". The {manufacturer|producer|maker|supplier} #file_links<>links/imp_files/19.08.15.txt",1,S] {recommends|suggests|advises} that {a decision|a choice} be made whether to {discontinue|cease|terminate|stop} nursing or to {discontinue|cease|terminate|stop} mefenamic acid, {taking {into|right into} account|considering|taking into consideration|thinking about} the {importance|significance|value|relevance} of the {drug|medicine|medication} to the {mother|mom|mommy}. Depakote {can|could} {also|likewise|additionally} {cause|trigger|create|induce} {serious|major|severe|significant} {harm|damage|injury} to #file_links<>links/imp_files/19.08.15.txt",1,S] the {pancreas|pancreatic}, which {may|might|could} {{get|obtain|acquire} {worse|even worse}|become worse|worsen} {quickly|rapidly|swiftly|promptly}. You {must|should|need to|have to} {avoid|prevent|stay clear of|stay away from} {pregnancy|maternity} not {only|just} {during|throughout} #file_links<>links/imp_files/19.08.15.txt",1,S] the {period|duration} of the {treatment|therapy|procedure} {but|however|yet} {also|likewise|additionally} one month {before|previously|in the past} and a month after it.

configure tomcat

  • find out your tomcat's user directory:
# cat /etc/passwd|grep tomcat
tomcat6:x:113:116::/usr/share/tomcat6:/bin/false
in this case it is /usr/share/tomcat6
  • create a folder .guacamole in your tomcat's user directory:
mkdir /usr/share/tomcat6/.guacamole
  • link guacamole.properties into your tomcat's user directories' guacamole folder
ln -s /etc/guacamole/guacamole.properties /usr/share/tomcat6/.guacamole

finishing

  • start a vnc server, as password set password (the vnc password given in user-mappings.xml)
vncserver
  • restart your tomcat server
/etc/init.d/tomcat6 restart

Guacamole-after-login.png

Now when you click on "Default" you will see your VNC desktop in your browser.

  • next steps: SSL
  • next steps: proxypass

Persist it

Add the following line to /etc/crontab: 

@reboot root /usr/local/sbin/guacd &

TroubleShooting

invalid login

  • now the problem is that tomcat does not know where to find the Authentication class:

/var/lib/tomcat6/webapps/guacamole/WEB-INF/classes/net/sourceforge/guacamole/net/basic/BasicFileAuthenticationProvider.class

is not in /etc/guacamole/guacamole.properties

  • so add it
  • cat /etc/passwd gives me a line
tomcat6:x:113:116::/usr/share/tomcat6:/bin/false

ll /usr/share/tomcat6/.guacamole/
total 8
drwxr-xr-x 2 root root 4096 Nov 26 07:58 ./
drwxr-xr-x 6 root root 4096 Nov 26 07:57 ../
lrwxrwxrwx 1 root root   35 Nov 26 07:58 guacamole.properties -> /etc/guacamole/guacamole.properties
  • works now. So the thing is:
    • take care that it is called guacamole and not guacamole-0.8.3 (sure?)
    • make sure the classpath in /etc/guacamole/guacamole.properties is correct, e.g.
# Location to read extra .jar's from
lib-directory:  /var/lib/tomcat6/webapps/guacamole/WEB-INF/classes

Server error

  • now I got a server error so I straced guacd:
strace -p 15332

and saw 

[pid 20344] open("/usr/lib/x86_64-linux-gnu/libguac-client-vnc.so", O_RDONLY) = -1 ENOENT (No such file or directory)

so the problem is that libguac-client-vnc.so is missing.

  • downloaded java version 1.7.45 and compiled guacamole-client using mvn. But there was no *.so* file in it
  • so installed libvncserver-dev and rebuild and reinstalled guacamole-server
  • and there it is, libguac-client-vnc.so
  • now the error message changed from "server error" to "unauthorized"

Failed to load

When logging in I got an error message 

Failed to execute 'send' on 'XMLHttpRequest': Failed to load 'http://162.209.103.145:8080/guacamole-0.8.3/login'.

Solution was to: 

/etc/init.d/tomcat6 restart

Error initializing VNC client

After logging in I got the error message 

Error initializing VNC client

Solution was to start 

vncserver

Could not connect

If you surf to the page and get an error message like 

Unable to connect

It probably means that tomcat is not running. It must be possible to connect to port 8080, a java process for tomcat must be running. 

/etc/init.d/tomcat6 status

must deliver something like 

* Tomcat servlet engine is running with pid 17546

See also

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