#问题：

An error has occurred\
The application failed to start.

The application exited during initialization.

#1. 检查R包的安装

• 是否调用的所有R包都已安装

使用root安装，在个人用户下安装是不行的。

$ sudo su - -c "R -e \"install.packages('WGCNA', repos='http://cran.rstudio.com/', dependencies = TRUE)\""

或，下载到本地：

$ su
$ R CMD INSTALL WGCNA_1.69-81.tar.gz

注：检查所有安装的包

#2.修改配置文件

• shiny-server配置
• shiny-server 配置文件

$ vi  /etc/shiny-server/shiny-server.conf
# Define the user we should use when spawning R Shiny processes
run_as shiny;

# Define a top-level server which will listen on a port
server {
  # Instruct this server to listen on port 3838
  listen 3838;

  # Define the location available at the base URL
  location / {
    #### PRO ONLY ####
    # Only up tp 20 connections per Shiny process and at most 3 Shiny processes
    # per application. Proactively spawn a new process when our processes reach 
    # 90% capacity.
    utilization_scheduler 20 .9 3;
    #### END PRO ONLY ####

    # Run this location in 'site_dir' mode, which hosts the entire directory
    # tree at '/srv/shiny-server'
    site_dir /srv/shiny-server;
    
    # Define where we should put the log files for this location
    log_dir /var/log/shiny-server;
    
    # Should we list the contents of a (non-Shiny-App) directory when the user 
    # visits the corresponding URL?
    directory_index on;
  }
}

# Setup a flat-file authentication system. {.pro}
auth_passwd_file /etc/shiny-server/passwd;

# Define a default admin interface to be run on port 4151. {.pro}
admin 4151 {
  # Only permit the user named `admin` to access the admin interface.
  required_user admin;
}

• run_as shiny: shiny改为linux用户名
• 检查app路径，一般是：/srv/shiny-server；不是这个路径，就检查权限，可用chmod修改。