[#ZBX-20688] Web scenario required pattern

[ZBX-20688] Web scenario required pattern Created: 2022 Mar 01 Updated: 2024 Apr 10 Resolved: 2022 Jul 28
Status:	Closed
Project:	ZABBIX BUGS AND ISSUES
Component/s:	Appliance (L), Server (S)
Affects Version/s:	6.0.1
Fix Version/s:	None

Type:

Problem report

Priority:

Major

Reporter:

Andrei Ioachim

Assignee:

Vladislavs Sokurenko

Resolution:

Won't fix

Votes:

3

Labels:

OVF, appliance

Remaining Estimate:

Not Specified

Time Spent:

Not Specified

Original Estimate:

Not Specified

Attachments:

curl-5.4.10.txt

curl-6.0.txt

image-2022-03-01-12-02-32-555.png

image-2022-03-01-12-02-56-006.png

image-2022-03-01-12-06-06-064.png

image.png

Team:

Team A

Sprint:

Sprint 86 (Mar 2022), Sprint 87 (Apr 2022), Sprint 88 (May 2022), Sprint 89 (Jun 2022), Sprint 90 (Jul 2022)

Description

Steps to reproduce:

created new host google.com
added new web scenario to get index page
step1: url https://www.google.com/, required string: Google, required status code: 200{}

Result:

See screenshot...

See log file...

Expected:
"google" to be found on page

this worked for me in 5.4, but it's not working in 6.0

also tested using the official "Open virtualization format (.ovf)" appliance image

Comments

Comment by Aleksey Volodin [ 2022 Mar 01 ]

Hello!

Thank you for reporting this.

Can you please try this command from Zabbix 6 hosts and from 5.4:

curl https://www.google.com/

Best regards,
Aleksey

Comment by Andrei Ioachim [ 2022 Mar 01 ]

using 5.4.10 appliance

curl https://www.google.com/ -o curl-5.4.10.txt

curl-5.4.10.txt

^{6.0 appliance}

curl https://www.google.com/ -o curl-6.0.txt

Comment by Edgar Akhmetshin [ 2022 Mar 03 ]

Hello Andrei,

Could you please confirm with HTTP agent which content you receive (setup simple http agent to retrieve page content)?
https://www.zabbix.com/documentation/current/en/manual/config/items/itemtypes/http

Do you have any content filtering/rate limiting behind appliance?

No able to reproduce using appliance or docker.

Comment by Andrei Ioachim [ 2022 Mar 03 ]

ok, so creating an item with http agent and "https://www.google.com/" gives me the error: "Server returned invalid UTF-8 sequence"

so i changed to "https://github.com/" and used preprocessing match regexp "Google" which works.

i changed in web scenario to use url "https://github.com/" and now i get a query error in zabbix_server.log

  1175:20220303:161355.501 [Z3005] query failed: [1406] Data too long for column 'value' at row 1 [insert into history_text (itemid,clock,ns,value) values (42694,1646324034,821719249,'

and there is a dump of the github page

mysql tables are not modified:

mysql> describe history_text;
+--------+-----------------+------+-----+---------+-------+
| Field  | Type            | Null | Key | Default | Extra |
+--------+-----------------+------+-----+---------+-------+
| itemid | bigint unsigned | NO   | PRI | NULL    |       |
| clock  | int             | NO   | PRI | 0       |       |
| value  | text            | NO   |     | NULL    |       |
| ns     | int             | NO   | PRI | 0       |       |
+--------+-----------------+------+-----+---------+-------+

the same web scenario using github works in 5.4.10

Comment by Edgar Akhmetshin [ 2022 Mar 04 ]

Please clarify:

show create table history_text;

And also which exact appliance image was used?

Comment by Andrei Ioachim [ 2022 Mar 04 ]

"Open virtualization format (.ovf)" appliance image
zabbix_appliance-6.0.0.ovf

mysql> show create table history_text;
+--------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Table        | Create Table                                                                                                                                                                                                                                                                           |
+--------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| history_text | CREATE TABLE `history_text` (
  `itemid` bigint unsigned NOT NULL,
  `clock` int NOT NULL DEFAULT '0',
  `value` text COLLATE utf8mb4_bin NOT NULL,
  `ns` int NOT NULL DEFAULT '0',
  PRIMARY KEY (`itemid`,`clock`,`ns`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin |
+--------------+--------------------------------------------------

Comment by Edgar Akhmetshin [ 2022 Mar 08 ]

Thank you, just to confirm, if create zabbix-server override file with the following content:

systemctl edit zabbix-server

And add the following lines:

[Service]
LimitSTACK=infinity
LimitMEMLOCK=infinity

After reload systemd configuration and restart Zabbix Server:

systemctl daemon-reload
systemctl restart zabbix-server

Please check if this error will happen again and web scenario works correctly:

regexp_exec(): failed with error -8

Comment by Andrei Ioachim [ 2022 Mar 08 ]

yes, thank you very much.

adding

LimitMEMLOCK=infinity

to zabbix-server service fixed the web scenarios.

(limitstack=infinity was already set)

Comment by Vladislavs Sokurenko [ 2022 Jul 19 ]

Can you please be so kind and check if ~~ZBX-21086~~ helped with the issue ?

Comment by Vladislavs Sokurenko [ 2022 Jul 19 ]

The error is:
#define PCRE2_ERROR_UTF8_ERR6 (-8)

In ~~ZBX-21086~~ it was

#define PCRE2_ERROR_UTF8_ERR20 (-22)

Please upgrade as it should be resolved now, closing, thanks !

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