usefull links:
https://hub.docker.com/r/onlyoffice/documentserver
https://docs.docker.com/engine/reference/commandline/container_run/

from rancher docker run:

    docker image pull onlyoffice/documentserver
    docker run -itd -p 8080:80 --name onlyoffice 
    -v onlyoffice.logs:/var/log/onlyoffice  
    -v onlyoffice.Data:/var/www/onlyoffice/Data 
    onlyoffice/documentserver

or for SSL setup run

    docker run -itd -p 6444:443 --name onlyoffice 
    -v onlyoffice.logs:/var/log/onlyoffice  
    -v onlyoffice.Data:/var/www/onlyoffice/Data 
    onlyoffice/documentserver

generate certificates for onlyoffice inside container

    docker exec -ti onlyoffice bash
    cd /var/www/onlyoffice/Data/
    mkdir certs
    cd certs
    openssl genrsa -out onlyoffice.key 2048
    openssl req -new -key onlyoffice.key -out onlyoffice.csr
    openssl x509 -req -days 365 -in onlyoffice.csr -signkey onlyoffice.key -out onlyoffice.crt
    exit

edit default.json

 cd /etc/onlyoffice/documentserver/
 nano default.json
under
"services": {
.
.
.
"requestDefaults": {
"rejectUnauthorized": true

change “rejectUnauthorized”: false and save

restart container

    docker restart onlyoffice

take contol if onlyoffice is running in web browser

    https://ip_address