About: strange phenomenon on domjudge with system which has a hardware load balancer configuration.

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***UNCHECKED*** An error dialog...

Tran Binh Duong (FE FPTU HN)

31 Oct 2020 31 Oct '20

5:49 p.m.

Hi all,

Our contestants feedback about the error as follow: “Invalid CSRF token”, moreover contestants were frequently experienced with kicking out phenomenon and very hard to log back into the system.

Our configuration is briefly depicted as follow:

/ domserver 1 \ Client ——> HW load balancer < >== Mysql DB \ domserver 2 /

Please give me some advice to solve the issue.

Trần Bình Dương (Mr) IT Lecturer Software Engineering Department , FPT University 29th Kilometer Thang Long Boulevard, Thach Hoa commune, Thach That Province, Education and Training Area, Hoa Lac High Tech Park, Ha Noi Mobile:(+84) 936168165 Skype: avn_duong.tb E-mail: duongtb@fe.edu.vn Website: ....

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Nicky Gerritsen

31 Oct 31 Oct

5:52 p.m.

You need to share sessions between the web servers. See https://github.com/DOMjudge/domjudge/wiki/Scaling-and-load-testing

Nicky On 31 Oct 2020, 11:50 +0100, Tran Binh Duong (FE FPTU HN) DuongTB@fe.edu.vn, wrote:

...

Hi all,

Our contestants feedback about the error as follow: “Invalid CSRF token”, moreover contestants were frequently experienced with kicking out phenomenon and very hard to log back into the system.

Our configuration is briefly depicted as follow:

/ domserver 1 \ Client ——> HW load balancer < >== Mysql DB \ domserver 2 /

Please give me some advice to solve the issue.

Trần Bình Dương (Mr) IT Lecturer Software Engineering Department , FPT University 29th Kilometer Thang Long Boulevard, Thach Hoa commune, Thach That Province, Education and Training Area, Hoa Lac High Tech Park, Ha Noi Mobile:(+84) 936168165 Skype: avn_duong.tb E-mail: duongtb@fe.edu.vn Website: ....

DOMjudge-devel mailing list DOMjudge-devel@domjudge.org https://www.domjudge.org/mailman/listinfo/domjudge-devel

Tran Binh Duong (FE FPTU HN)

6:50 p.m.

New subject: Trả lời: About: strange phenomenon on domjudge with system which has a hardware load balancer configuration.

Hi Nicky,

Thanks for your response, I read the document at https://symfony.com/doc/current/session/database.html [https://symfony.com/images/opengraph/symfony.png]https://symfony.com/doc/current/session/database.html Store Sessions in a Database (Symfony Docs)https://symfony.com/doc/current/session/database.html These are parameters that you can configure: db_table (default sessions): The name of the session table in your database; db_username: (default: '') The username used to connect when using the PDO configuration (when using the connection based on the DATABASE_URL env var, it overrides the username defined in the env var). db_password: (default: '') The password used to connect when using the ... symfony.com But because I am not familiar with symfony, so I don't understand the structure and the method when developing and configuring in Symfony. Therefore, the content of the document is quite difficult to me to make sure how to start. Should I use only PHP to complete the configuration or I have to configure in three kind of document including YAML, XML and PHP? If I use only PHP, what should I do? Just follow the guide on TAB PHP is enough?

Regards, Trần Bình Dương (Mr) IT Lecturer Software Engineering Department , FPT University 29th Kilometer Thang Long Boulevard, Thach Hoa commune, Thach That Province, Education and Training Area, Hoa Lac High Tech Park, Ha Noi Mobile:(+84) 936168165 Skype: avn_duong.tb E-mail: duongtb@fe.edu.vn Website: ....

________________________________ Từ: Nicky Gerritsen nickygerritsen@me.com Đã gửi: 31 Tháng Mười 2020 5:52 CH Đến: domjudge-devel@domjudge.org domjudge-devel@domjudge.org; Tran Binh Duong (FE FPTU HN) DuongTB@fe.edu.vn Chủ đề: Re: About: strange phenomenon on domjudge with system which has a hardware load balancer configuration.

You need to share sessions between the web servers. See https://github.com/DOMjudge/domjudge/wiki/Scaling-and-load-testing

Nicky On 31 Oct 2020, 11:50 +0100, Tran Binh Duong (FE FPTU HN) DuongTB@fe.edu.vn, wrote: Hi all,

Our contestants feedback about the error as follow: “Invalid CSRF token”, moreover contestants were frequently experienced with kicking out phenomenon and very hard to log back into the system.

Our configuration is briefly depicted as follow:

/ domserver 1 \ Client ——> HW load balancer < >== Mysql DB \ domserver 2 /

Please give me some advice to solve the issue.

_______________________________________________ DOMjudge-devel mailing list DOMjudge-devel@domjudge.org https://www.domjudge.org/mailman/listinfo/domjudge-devel

Nicky Gerritsen

6:51 p.m.

New subject: Trả lời: About: strange phenomenon on domjudge with system which has a hardware load balancer configuration.

You can choose. I have never set it up with symfony so I can’t really help. Hopefully google will help you

Nicky On 31 Oct 2020, 12:50 +0100, Tran Binh Duong (FE FPTU HN) DuongTB@fe.edu.vn, wrote:

...

Hi Nicky,

Thanks for your response, I read the document at https://symfony.com/doc/current/session/database.html Store Sessions in a Database (Symfony Docs) These are parameters that you can configure: db_table (default sessions): The name of the session table in your database; db_username: (default: '') The username used to connect when using the PDO configuration (when using the connection based on the DATABASE_URL env var, it overrides the username defined in the env var). db_password: (default: '') The password used to connect when using the ... symfony.com But because I am not familiar with symfony, so I don't understand the structure and the method when developing and configuring in Symfony. Therefore, the content of the document is quite difficult to me to make sure how to start. Should I use only PHP to complete the configuration or I have to configure in three kind of document including YAML, XML and PHP? If I use only PHP, what should I do? Just follow the guide on TAB PHP is enough?

Regards, Trần Bình Dương (Mr) IT Lecturer Software Engineering Department , FPT University 29th Kilometer Thang Long Boulevard, Thach Hoa commune, Thach That Province, Education and Training Area, Hoa Lac High Tech Park, Ha Noi Mobile:(+84) 936168165 Skype: avn_duong.tb E-mail: duongtb@fe.edu.vn Website: ....

Từ: Nicky Gerritsen nickygerritsen@me.com Đã gửi: 31 Tháng Mười 2020 5:52 CH Đến: domjudge-devel@domjudge.org domjudge-devel@domjudge.org; Tran Binh Duong (FE FPTU HN) DuongTB@fe.edu.vn Chủ đề: Re: About: strange phenomenon on domjudge with system which has a hardware load balancer configuration.

You need to share sessions between the web servers. See https://github.com/DOMjudge/domjudge/wiki/Scaling-and-load-testing

Nicky On 31 Oct 2020, 11:50 +0100, Tran Binh Duong (FE FPTU HN) DuongTB@fe.edu.vn, wrote:

...
Hi all,

Our contestants feedback about the error as follow: “Invalid CSRF token”, moreover contestants were frequently experienced with kicking out phenomenon and very hard to log back into the system.

Our configuration is briefly depicted as follow:

/ domserver 1 \ Client ——> HW load balancer < >== Mysql DB \ domserver 2 /

Please give me some advice to solve the issue.

Trần Bình Dương (Mr) IT Lecturer Software Engineering Department , FPT University 29th Kilometer Thang Long Boulevard, Thach Hoa commune, Thach That Province, Education and Training Area, Hoa Lac High Tech Park, Ha Noi Mobile:(+84) 936168165 Skype: avn_duong.tb E-mail: duongtb@fe.edu.vn Website: ....

DOMjudge-devel mailing list DOMjudge-devel@domjudge.org https://www.domjudge.org/mailman/listinfo/domjudge-devel

Tran Binh Duong (FE FPTU HN)

1 Nov 1 Nov

1:58 a.m.

New subject: ***UNCHECKED*** Trả lời: Trả lời: About: strange phenomenon on domjudge with system which has a hardware load balancer configuration.

Hi,

I coped with this error but I don't know how to fix it. When I upload a new problem to the system, it's show the message: "Error: problem.externalid: A problem with the same `externalid` already exists - is this a duplicate?" Even I checked that in my problem package, I used a new probid.

It's strange with this version compare with the logic on version 5.3.2

Regards,

________________________________ Từ: Nicky Gerritsen nickygerritsen@me.com Đã gửi: 31 Tháng Mười 2020 6:51 CH Đến: domjudge-devel@domjudge.org domjudge-devel@domjudge.org; Tran Binh Duong (FE FPTU HN) DuongTB@fe.edu.vn Chủ đề: Re: Trả lời: About: strange phenomenon on domjudge with system which has a hardware load balancer configuration.

You can choose. I have never set it up with symfony so I can’t really help. Hopefully google will help you

Nicky On 31 Oct 2020, 12:50 +0100, Tran Binh Duong (FE FPTU HN) DuongTB@fe.edu.vn, wrote: Hi Nicky,

You need to share sessions between the web servers. See https://github.com/DOMjudge/domjudge/wiki/Scaling-and-load-testing

Nicky On 31 Oct 2020, 11:50 +0100, Tran Binh Duong (FE FPTU HN) DuongTB@fe.edu.vn, wrote: Hi all,

Our contestants feedback about the error as follow: “Invalid CSRF token”, moreover contestants were frequently experienced with kicking out phenomenon and very hard to log back into the system.

Our configuration is briefly depicted as follow:

/ domserver 1 \ Client ——> HW load balancer < >== Mysql DB \ domserver 2 /

Please give me some advice to solve the issue.

_______________________________________________ DOMjudge-devel mailing list DOMjudge-devel@domjudge.org https://www.domjudge.org/mailman/listinfo/domjudge-devel

Tran Binh Duong (FE FPTU HN)

6:56 a.m.

New subject: Trả lời: About: strange phenomenon on domjudge with system which has a hardware load balancer configuration.

Hi,

Thank you, I choose YAML but it seem not work. The step are easy but I don’t where to put the createTable() function of the service and where the reference. I created sessions table on mysql database but it still empty when I logged to the system.

You can choose. I have never set it up with symfony so I can’t really help. Hopefully google will help you

Nicky On 31 Oct 2020, 12:50 +0100, Tran Binh Duong (FE FPTU HN) DuongTB@fe.edu.vn, wrote: Hi Nicky,

You need to share sessions between the web servers. See https://github.com/DOMjudge/domjudge/wiki/Scaling-and-load-testing

Nicky On 31 Oct 2020, 11:50 +0100, Tran Binh Duong (FE FPTU HN) DuongTB@fe.edu.vn, wrote: Hi all,

Our contestants feedback about the error as follow: “Invalid CSRF token”, moreover contestants were frequently experienced with kicking out phenomenon and very hard to log back into the system.

Our configuration is briefly depicted as follow:

/ domserver 1 \ Client ——> HW load balancer < >== Mysql DB \ domserver 2 /

Please give me some advice to solve the issue.

_______________________________________________ DOMjudge-devel mailing list DOMjudge-devel@domjudge.org https://www.domjudge.org/mailman/listinfo/domjudge-devel

Tran Binh Duong (FE FPTU HN)

6:59 a.m.

New subject: Trả lời: About: strange phenomenon on domjudge with system which has a hardware load balancer configuration.

I solved the problem by connecting directly to the database and change externalid of some problems, but the logic was made me confused, I’ve never met that kind of message on version 5.3.2

________________________________ Từ: Tran Binh Duong (FE FPTU HN) DuongTB@fe.edu.vn Đã gửi: 01 Tháng Mười Một 2020 6:56 SA Đến: Nicky Gerritsen nickygerritsen@me.com; domjudge-devel@domjudge.org domjudge-devel@domjudge.org Chủ đề: Re: Trả lời: About: strange phenomenon on domjudge with system which has a hardware load balancer configuration.

Hi,

You can choose. I have never set it up with symfony so I can’t really help. Hopefully google will help you

Nicky On 31 Oct 2020, 12:50 +0100, Tran Binh Duong (FE FPTU HN) DuongTB@fe.edu.vn, wrote: Hi Nicky,

You need to share sessions between the web servers. See https://github.com/DOMjudge/domjudge/wiki/Scaling-and-load-testing

Nicky On 31 Oct 2020, 11:50 +0100, Tran Binh Duong (FE FPTU HN) DuongTB@fe.edu.vn, wrote: Hi all,

Our contestants feedback about the error as follow: “Invalid CSRF token”, moreover contestants were frequently experienced with kicking out phenomenon and very hard to log back into the system.

Our configuration is briefly depicted as follow:

/ domserver 1 \ Client ——> HW load balancer < >== Mysql DB \ domserver 2 /

Please give me some advice to solve the issue.

_______________________________________________ DOMjudge-devel mailing list DOMjudge-devel@domjudge.org https://www.domjudge.org/mailman/listinfo/domjudge-devel

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Nicky Gerritsen
Tran Binh Duong (FE FPTU HN)