Dear R studio Community.
I'm using the latest version of R-Studio-Server and Shiny-Server (open source).
Why does app.R not work in shiny-server even though it works on R-studio server?
Here is the source code (same as basic shiny app demo)
library(shiny)
# Define UI for application that draws a histogram
# Application title
titlePanel("Old Faithful Geyser Data"),
ui <- fluidPage(
# Sidebar with a slider input for number of bins
sidebarLayout(
sidebarPanel(
sliderInput("bins",
"Number of bins:",
min = 1,
max = 50,
value = 30)
),
# Show a plot of the generated distribution
mainPanel(
plotOutput("distPlot")
)
)
)
# Define server logic required to draw a histogram
server <- function(input, output) {
output$distPlot <- renderPlot({
# generate bins based on input$bins from ui.R
x <- faithful[, 2]
bins <- seq(min(x), max(x), length.out = input$bins + 1)
# draw the histogram with the specified number of bins
hist(x, breaks = bins, col = 'darkgray', border = 'white')
})
}
# Run the application
shinyApp(ui = ui, server = server)
-
app.R works on R studio-server
-
app.R does not work on Shiny web-server
-
here is the Shiny web-server log.
Listening on http://127.0.0.1:46479
Warning in pngfun(filename = filename, width = width, height = height, res = res, :
unable to open connection to X11 display ''
Warning: Error in .External2: unable to start device PNG
127: pngfun
126: startPNG
125: drawPlot
111: <reactive:plotObj>
95: drawReactive
82: origRenderFunc
81: output$distPlot
1: runApp
output of capabilities()
> capabilities()
jpeg png tiff tcltk X11 aqua
TRUE TRUE TRUE TRUE FALSE FALSE
http/ftp sockets libxml fifo cledit iconv
TRUE TRUE TRUE TRUE TRUE TRUE
NLS profmem cairo ICU long.double libcurl
TRUE FALSE TRUE TRUE TRUE TRUE
- version information
> version()
platform x86_64-pc-linux-gnu
arch x86_64
os linux-gnu
system x86_64, linux-gnu
status
major 3
minor 6.3
year 2020
month 02
day 29
svn rev 77875
language R
version.string R version 3.6.3 (2020-02-29)
nickname Holding the Windsock
it might be related to "Shiny-server on ubuntu 16 error: "unable to open connection to X11 display ''"
but re-installation does not solve the issue in my case.
(I use 'sudo' command to install R using 'apt' command)
thanks.